I need urgent help. I have this question:
Use implicit differentiation to find an equation of the tangent line to the curve at the given point.
\begin{equation}
{x}^{2/3}+{y}^{2/3}=4
\\
\left(-3\sqrt{3}, 1\right)\end{equation}
(astroid)
x^{\frac{2}{3}}+y^{\frac{2}{3}}=4
My answer is...
Homework Statement
The radius of a circle increases from 3 to 3.01 cm. Find the approximate change in its perimeter.
Here's a link to the actual question, in case you need the answer for 6(a) to solve 6(b)
http://imgur.com/a/nQt6M
Homework Equations
Perimeter of circle = 2πr
Area of circle =...
I thought Differentiation is all about understanding it in a graph. Every time I solve a question on differentiation I visualise it as a graph so it's more logical. After all, that IS what the whole topic is about, right? Or am I just wrong?
But when you look at these questions...
Homework Statement
Homework Equations
$$(x-a)(x+a)=x^2-a^2$$
The Attempt at a Solution
I have to express ##~\displaystyle x^2+16=f\left( \frac{x}{x-1} \right)##
I guess it has to be ##~\displaystyle \left( \frac{x}{x-1} \right)^n-a~## or ##~\displaystyle \left( \frac{x}{x-1} \pm a...
Homework Statement
[/B]
2. The attempt at a solution
I'm not really sure where to start. We just want to show that ##\lim_{x \to c} \frac{f(x) - f(c)}{x - c} = 0##. I see that ##\lim_{x \to c} (x - c)^2 = 0##. I feel that this may be a simple trick of inequalities, but I am having a complete...
Homework Statement
##x^3 - 4x^2 + ax + b##
tangent to x-axis at x = 3
Homework EquationsThe Attempt at a Solution
if the graph tangent at x = 3, means at x =3, y = 0
my questions is, is at x = 3 the graph's gradient (slope) = 0 ?
if yes why?
if yes then means dy/dx = 0
##3x^2 - 8x + a = 0##...
Homework Statement
Hello
I have this circle with the equation : [/B]
(x-a)^2+(y-b)^2=r^2
I want to find dy/dx for it
2. Homework Equations
(x-a)^2+(y-b)^2=r^2
The Attempt at a Solution
I am looking on the internet and it appears that I should use what is called "Implicit differentiation"...
Homework Statement : [/B]find the dy/dx of xy=a constantHomework Equations : basic differentiation formulae[/B]The Attempt at a Solution :[/B]
I know we can use logarithmic differentiation for differentiating x y..But can we differentiate it using chain rule and get answer as
yxy-1.dy/dx =0. ?
Hello, friends! I know, thanks to @Hawkeye18 who proved this identity to me, that, if ##\phi:V\to\mathbb{R}## is a bounded measurable function defined on the bounded measurable domain ##V\subset\mathbb{R}^3##, then, for any ##k\in\{1,2,3\}##,
$$\frac{\partial}{\partial r_k}\int_V...
Dear friends,
I have found a derivation of the fact that, under the assumptions made in physics on ##\rho## (to which we can give the physical interpretation of charge density) the function defined by
$$V(\mathbf{x},t):=\frac{1}{4\pi\varepsilon_0}\int_{\mathbb{R}^3}...
For implicit differentiation, is dy/dx of x2+y2 = 50 the same as y2 = 50 - x2 ?
From what I can take it, it'd be a no since.
For x2+y2 = 50,
d/dx (x2+y2) = d/dx (50) --- will eventually be ---> dy/dx = -x/y
Where,
y2 = 50 - x2
y = sqrt(50 - x2)
dy/dx = .5(-x2+50)-.5*(-2x)
Problem:
How fast is the area of a rectangle changing if one side is I0 cm
long and is increasing at a rate of 2 cm/s and the other side is 8 cm
long and is decreasing at a rate of 3 cm/s?I have 2 approach and I want to know which is correct, why and what am I missing
Homework Statement
Use the top line to get 1) and 2)
Homework Equations
above
The Attempt at a Solution
So for 2) split the log up using ##log (AB)=log (A) + log (B) ## and this is simple enough
I think I may be doing something stupid with 1) though. I have
##\frac{\partial}{\partial...
Homework Statement
This is my 'carrying out a practical investigation' assignment for Maths. I've attached the coursework (what I've wrote up to now) and my main concern is whether I've got the right differential equation to find 3 new velocity values throughout the pendulum trajectory...
First of all there is an equation
Then there is the derivative
Then there is a point slope formula to find the equation of the tangent line
Point slope formula to obtain the tangent line .
y=3a2(x-a)+a3
Then Plug in the x coordinate into the derivative to get the slope
f'(1) = 3(1)2
f'(1) = 3...
I have some beginner doubts about Calculus and Differential equations .
Is a function always a curve ?
Doesn't a function already has a slope ?
d/dx of a function gives the gradient of the curve between two points ?
The derivative ,d/dx ,The gradient , is the rate of change of a...
(I am not very sure if this is a high-school level question or a undergraduate level question. Sorry.)
Does our normal differentiation rules, like the product rule and quotient rule apply to vectors?
Say for example, differentiate ##r \times \dot r##
##r## is radius vector, ##\dot r## is the...
Homework Statement
See attached.
to get ##p## I need to differentiate ##F## w.r.t ##V##, but I also have that the upper limit ##T_{D}## depends on ##V##, so I must take this into consideration when doing the differentiation.
The solution looks as though it has done this without evaluating...
I'm just in need of some clearing up of how to differentiate the lagrangian with respect to the covariant derivatives when solving the E-L equation:
Say we have a lagrangian density field
\begin{equation}
\mathcal{L}=\frac{1}{2}(\partial_{\mu}\hat{\phi})(\partial^{\mu}\hat{\phi})
\end{equation}...
Homework Statement
Okey her we go
I was given a base code called heat_equation_primer. The goal is to implement a optimizer into the program. The two methods that are going to be used is the Quasi-Newton and Steepest descent with search line. So I need gradients. So I tried to differentiate as...
I am looking at a proof from a book in fluid dynamics on time differentiation of fluid line integrals -
Basically I am looking at the second term on the RHS in this equation
$$ d/dt \int_L dr.A = \int_L dr. \partial A / \partial t + d/dt \int_L dr.A$$
The author has a field vector A for a...
Say we have the following integral: ##\displaystyle \int_0^1 \frac{\log (x+1)}{x^2+1}##. I know how to do this integral with a tangent substitution. However, I saw another method, which was by differentiating ##f## under the integral with respect to the parameter ##t##, where we let...
I'm using this method:
First, write the polynomial in this form:
$$a_nx^n+a_{n-1}x^{n-1}+...a_2x^2+a_1x=c$$
Let the LHS of this expression be the function ##f(x)##. I'm going to write the Taylor series of ##f^{-1}(x)## around ##x=0## and then put ##x=c## in it to get ##f^{-1}(c)## which will be...
Homework Statement
[/B]
Summarizing: two civilizations hate each other, one of the civilizations throws a curse at the second. The second civilization succumbs to chaos and has a change in Population each week of ΔP= -√P. That is:
Pn = Pn-1-√Pn-1
Homework Equations
[/B]
Considering that the...
Let's have a snack challenge for a while. ^^
Let x and y be real numbers (with restrictions y \ne 0, \ y \ne -x) and \frac{x - y}{x + y} = \frac{x + y}{y}.
Find \frac{\mathrm{d}y}{\mathrm{d}x} in whatever form you like most. I mean, for example forms \frac{\mathrm{d}y}{\mathrm{d}x} = f(x, y)...
Dear Friends
So, i have this special case where i have to do a differentiation and summation.
Please check the following.
Is it okay ?? Or, i how should i proceed with this ?
Homework Statement
For the given function z to demonstrate the equality:
[/B]As you see I show the solution provided by the book, but I have some questions on this.
I don't understand how the partial derivative of z respect to x or y has been calculated.
Do you think this is correct?
I...
Is it possible to calculate the rate of change of n with respect to rate of change of Pressure and rate of change of Temperature with V unknown but constant by PV = nRT?
Rate of change of Pressure and rate of change of temperature can be measured. R and V are constants.
Hey, I found a thread about part of what I'm trying to ask long ago: https://www.physicsforums.com/threads/implicit-differentiation.178328/
Basically, I noticed that if you multiply by x or by y in an equation before implicitly deriving, you get two different answers. Unfortunately their whole...
Homework Statement
Consider the Laplace Equation of a semi-infinite strip such that 0<x< π and y>0, with the following boundary conditions:
\begin{equation}
\frac{\partial u}{\partial x} (0, y) = \frac{\partial u}{\partial x} (0,\pi) = 0
\end{equation}
\begin{equation}
u(x,0) = cos(x)...
Could someone please help me work through the differentiation in a paper (not homework), I am having trouble finding out how they came up with their cost function.
The loss function is L=wE, where E=(G-Gest)^2 and G=F'F
The derivative of the loss function wrt F is proportional to F'(G-Gest)...
Homework Statement
I am told to find dy/dx by implicit differentiation where:
e^(x^2 * y) = x + y
Homework Equations
The above equation and the ln of it.The Attempt at a Solution
e^(x^2 * y) = x + y
(x^2 * y)ln(e) = ln(x+y)
x^2 * y = ln(x+y)
x^2(dy/dx) + y(2x) = 1/(x+y) * (1 + dy/dx)...
Homework Statement
a. Given u=F(x,y,z) and z=f(x,y) find { f }_{ xx } in terms of the partial derivatives of of F.
b. Given { z }^{ 3 }+xyz=8 find { f }_{ x }(0,1)\quad { f }_{ y }(0,1)\quad { f }_{ xx }(0,1)
Homework Equations
Implicit function theorem, chain rule diagrams, Clairaut's...
Here is the question:
This is the step I came to after taking the derivatives and doing some simplification:
^ I did the work myself on paper, I just couldn't type out the whole thing clearly so that anyone else can see what I'm referring too... so I used some online tool to show that...
Homework Statement
Find y''
Homework Equations
9x^2 +y^2 = 9
The Attempt at a Solution
y'
18x+2y(y')=0
y'=-18x/2y
y'=9x/y
For the second derivative, I get the correct answer (same as the book) up until the very last step.
Here's where I'm left at:
-9( (-9x^2 - y^2) / y^3 )
The book then...
<< Mentor Note -- thread moved from the technical math forums at OP request, so no Homework Help Template is shown >>
x2y + xy2 = 6
I know we use the chain rule from here, so wouldn't that be:
(d/dx)(x2y + xy2) = (d/dx)(6)
so using the chain rule of g'(x)f'(g(x) and the d/dx canceling out on...
Homework Statement
Refer to the photo, please verify my answer
Homework Equations
calculus
The Attempt at a Solution
For c, can I do it by assuming Ah=V.
A(dh/dt) + h(dA/dt) = dV/dt then find dA/dt?
Homework Statement
Find y' ...
X^2+y^2=25I understand (I think) implicit differentiation, but there is one issue which hangs me up. I've done this before and this is just a refresher as my last calculus course was four years ago.
From what I understand,
2x+2y(y')=0
But why isn't it...
First of all thanks for the help, i have a problem finding a good explanation of de ecuation (d/dx)f=(∂f/∂x)+(∂f/∂y)*(dy/dx) could anyone write me a good explanation of this ecuation? thanks for the help
If you have a function x = x(u,t)
then does u necessarily depend on x and t? so u = (x,t)
For example, if x(u,t)=u^2 t it seems that because t=x/u^2 , t=t(x,u)
I am having difficulty working out the general equation for dz \over dx if z=z(x,y,t) x=x(u,t) y=y(u,v,t)
The chain rule...
Homework Statement
I am doing an experiment where I am measuring the force a speaker is exerting when it is driven by a certain voltage and frequency, so my voltage and frequency values are known. I am assuming the speaker is undergoing SHM and I am measuring its peak to peak velocity...