Hi,

I'm having a lot of difficulty differentiating the following trig problems:

Question : Find $\displaystyle \frac{dy}{dx}$ for the following functions(Do not simplify the answer).

a) $\displaystyle 4 cos^2(\pi x)$

b) $\displaystyle tan^2 (cos x)$

c)$\displaystyle sin x +sin y=1$

I'm not even sure about how to start on these problems, and would greatly appreciate any helpful tips.

Thanks