# Thread: Find the 10th derivative of y = cos(3x)

1. ## Find the 10th derivative of y = cos(3x)

Find the 10th derivative of y = cos(3x)

2. Originally Posted by superduper1
Find the 10th derivative of y = cos(3x)
Write out the first few, see the pattern, voila. You could write out the 10000th derivative without a sweat.

4. Originally Posted by superduper1
Really? Am I a helper or a homework-machine?

Derivative of cos(3x) is -3sin(3x)

Derivative of that is -9cos(3x)

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5. Originally Posted by superduper1
You were told what to do. Please show what you have tried and say where you get stuck.

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### y=cos3x

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