Hi,
Im confused on what im doing wrong here to simplify this derivative.
The book comes up with a different answer.
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