Hi,

Im confused on what im doing wrong here to simplify this derivative.

The book comes up with a different answer.

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- Feb 9th 2013, 05:00 PMminneola24Derivative of a trig function
Hi,

Im confused on what im doing wrong here to simplify this derivative.

The book comes up with a different answer. - Feb 9th 2013, 07:46 PMhollywoodRe: Derivative of a trig function
When you used the chain rule, you should have multiplied instead of subtracting:

$\displaystyle f'(t)=6(\sec(\pi{t}-1))(\sec(\pi{t}-1)\tan(\pi{t}-1))(\pi)$

$\displaystyle f'(t)=6\pi\sec^2(\pi{t}-1)\tan(\pi{t}-1))$

- Hollywood