Derivative of Cos^3(x)*Sin(x) using Chain Rule

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In summary, the conversation is about a person seeking help with a derivative problem and asking if they are on the right track with their solution. The formula for the chain rule is mentioned and the person wonders if their solution is correct. They also mention that they only need the formula and not the answer. It is stated that it is against forum policy to provide answers. The formula for the chain rule is then explained with the variables u and v. The person then questions if their solution is correct. The summary also includes the correct solution for the derivative problem.
  • #1
CloDawg
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Help!
I last did this kind of work years ago in university. Can som1 please help me with the derivative.
 
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  • #2
I think the question is ((cosx)^3)*sin(x).Am I right?The formula for d(uv)/dx=u(dv/dx)+v(du/dx).And of course I think you need only formula.Do you need answer?
 
  • #3
omkar13 said:
I think the question is ((cosx)^3)*sin(x).Am I right?The formula for d(uv)/dx=u(dv/dx)+v(du/dx).And of course I think you need only formula.Do you need answer?
It is against Physics Forums policy to provide answers to posters' questions.
 
  • #4
Thats it chain rule or something:


d(uv)/dx=u(dv/dx)+v(du/dx)

u=sin(x)
v=cos^3(x)

(dv/dx) = -3sin((x))cos^2(x)
(du/dx) = cos(x)

d(uv)/dx= -3sin^2(x)cos^2(x) + cos^4(x)

Is this correct?
 

FAQ: Derivative of Cos^3(x)*Sin(x) using Chain Rule

What is the derivative of cos^3(x)*sin(x)?

The derivative of cos^3(x)*sin(x) is -3cos^2(x)sin^2(x) + cos^3(x)cos(x).

How do you find the derivative of cos^3(x)*sin(x)?

To find the derivative of cos^3(x)*sin(x), you can use the product rule, which states that the derivative of a product is equal to the first function times the derivative of the second function plus the second function times the derivative of the first function.

Can you simplify the derivative of cos^3(x)*sin(x)?

Yes, you can simplify the derivative of cos^3(x)*sin(x) to -3sin(x)cos^4(x) + cos^4(x).

What is the derivative of cos^3(x)*sin(x) at a specific point?

The derivative of cos^3(x)*sin(x) at a specific point can be found by plugging in the x-value of the point into the simplified derivative expression.

How does the graph of cos^3(x)*sin(x) and its derivative relate?

The graph of cos^3(x)*sin(x) and its derivative are related because the derivative represents the rate of change of the original function. This means that the derivative will have the same critical points (maxima, minima, points of inflection) as the original function, but at these points, the derivative will be either 0 or undefined.

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