Hi

Can someone show me how to find the max and min of the following equations without using the calculator:

1)$\displaystyle \frac{1}{2+sin(x)}$

i done $\displaystyle \frac{dy}{dx}$ and i got 1 however how do you get the minimum?

2)$\displaystyle \frac{1}{sin^2(x)+4}$

P.S