1. f(theta)= sec (theta) ^2
The answer is 2 theta sec^2 tan ^2 theta.
But I got 2sec ^2 theta tan theta.
2. y= sin^2 x- cos^2 x
The answer is 2sin2x.
But I got 4 sinxcosx.
I don't know how to get to these answers. Can someone please help me?
Thank you guys for reminding me to memorize my trig. identities and double-angle formulas!
@Chris L T521- I still don't understand the first problem. Using the chain rule,
I would bring 2 to the front minus one a power from sec theta ^2 to be left with sec theta, then multiply by its derivative sec theta tan theta.
What am I doing wrong here?