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## Homework Statement

If x = cos(3t) and y = (sin(3t))² find dy/dx and d²y/dx².

## Homework Equations

d/dx cosx = -sinx

d/dx sinx = cosx

## The Attempt at a Solution

dx/dt = -3sin3t

dy/dt = 6sin3tcos3t

Not sure what to do now.

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- Thread starter JBD2
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- #1

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If x = cos(3t) and y = (sin(3t))² find dy/dx and d²y/dx².

d/dx cosx = -sinx

d/dx sinx = cosx

dx/dt = -3sin3t

dy/dt = 6sin3tcos3t

Not sure what to do now.

- #2

Dick

Science Advisor

Homework Helper

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(dy/dt)/(dx/dt)=dy/dx, right?

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