Question

Здравствуйте! Помогите решить

Answer 1

$\int\limits^{\frac{\pi}{2} }_{-\frac{\pi}{2}} {cos(x)} \, dx \\\int\limits {cos(x)} \, dx=sin(x)\\F(b)-F(a)=sin(\frac{\pi}{2})-sin(-\frac{\pi}{2})=1-(-1)=2$