Find Derivative of y=sin(cos(sinx))

In summary, to find the derivative of y=sin(cos(sinx)), we use the chain rule and simplify to get -sin(cos(sinx))cosx.
  • #1
ggcheck
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Homework Statement


find the derivative using the appropriate rules

y=sin(cos(sinx))

The Attempt at a Solution



d/dx[sin(cos(sinx))] = [cos(cos(sinx))] * [-sin(sinx)] =

-cos(cos(sinx))(sin(sinx))

Is that right?

It doesn't feel right.
 
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  • #2
Try making an extended chain rule...let t=sinx and then u=cost ...and then differentiate and use the chain rule
 
  • #3
you're very close! 1 more angle
 
  • #4
is the first factor done? and -sin(sinx) needs more?
 
  • #5
something like this: y= sinu ; u=cos(t) ; t=sinx

d/du[y] * d/dt * d/dx[t] ?
 
Last edited:
  • #6
= cosu * (-sint) * cosx =

-sin(sinx)*cos(cos(sinx))*cosx ??
 
  • #7
well the chain rule is correct...so I would assume that it is correct
 
  • #8
It wouldn't be uncommon for me to apply a rule incorrectly.
 
  • #9
Well it is correct
 

FAQ: Find Derivative of y=sin(cos(sinx))

What is the derivative of y=sin(cos(sinx))?

The derivative of y=sin(cos(sinx)) is calculated using the chain rule, which states that the derivative of a composite function is the product of the derivative of the outer function and the derivative of the inner function. In this case, the outer function is sin(x) and the inner function is cos(sinx). Therefore, the derivative is cos(x) * (-sin(sinx)) * cos(sinx) = -cos(x) * sin(sinx) * cos(sinx).

Why is the chain rule used to find the derivative of y=sin(cos(sinx))?

The chain rule is used because y=sin(cos(sinx)) is a composite function, meaning that it is made up of multiple functions. By using the chain rule, we can break down the complex function into smaller, simpler functions and find the derivative of each one separately, making it easier to calculate the overall derivative.

Can the derivative of y=sin(cos(sinx)) be simplified further?

Yes, the derivative of y=sin(cos(sinx)) can be simplified further by using trigonometric identities. Using the identity cos(a) * sin(b) = (1/2) * sin(a + b) - (1/2) * sin(a - b), we can simplify the derivative to -(1/2) * sin(2x) * cos(sinx).

How does the graph of y=sin(cos(sinx)) and its derivative look like?

The graph of y=sin(cos(sinx)) and its derivative have similar shapes, but the derivative graph is shifted to the left by pi/2. The derivative graph also has a smaller amplitude compared to the original function.

What is the significance of finding the derivative of y=sin(cos(sinx))?

Finding the derivative of y=sin(cos(sinx)) allows us to determine the rate of change of the function at any given point. This is useful in many applications, such as optimization problems, where we need to find the maximum or minimum value of a function. The derivative also helps us understand the behavior of the original function, including its concavity and points of inflection.

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