Can anyone explain to me how to do this problem?

y=ln(cos(4x))

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- November 7th 2009, 03:45 PMiheartphysics01Differentiating functions with natural logs
Can anyone explain to me how to do this problem?

y=ln(cos(4x)) - November 7th 2009, 03:53 PMScott H
Welcome to the Math Help Forum! :)

The function may be differentiated by applying the Chain Rule twice, knowing that

For reference, the Chain Rule states that

- November 7th 2009, 03:53 PMVonNemo19
- November 7th 2009, 04:06 PMiheartphysics01
ok thanks so much!(Happy)

i will probably be using this forum a lot!