Apps of Differentiation help

Need help finding (a) Critical Numbers and (b) Inflection points for these two

**1.** $\displaystyle y = 2x - tanx $ ; $\displaystyle \frac{-pi}{2} < x < \frac{pi}{2}$

$\displaystyle y' = 2 - sec^2(x)$

$\displaystyle y'' = -sec(x)tan(x) $

**2. **$\displaystyle y = e^(-x) sinx $ ; 0 < or equal to x < or equal to 2pi

$\displaystyle y' = -e^x cosx $

$\displaystyle y'' = -e^x(-sinx) $ <--- **Not sure if that's correct**

I'm not very fond of trig functions and I need help with these two. I need help asap