Question

transformati in produs 1+sinx+cosx

Answer 1

$1+\sin x+\cos x=(1+\cos x)+\sin x=2\cos^2 \dfrac{x}{2}+2\sin \dfrac{x}{2}\cdot \cos \dfrac{x}{2}=\\ =2\cos \dfrac{x}{2}\left(\cos \dfrac{x}{2}+\sin \dfrac{x}{2}\right)$