Question

Qual o valor do limite [cos(pi/2-x)]=
quando x tende a 3pi/2

Answer 1

$\lim_{x \to \frac{3\pi}{2}} [cos(\frac{\pi}{2}-x)]= cos(\frac{\pi}{2}-\frac{3\pi}{2}) =cos(-\pi)=cos(\pi)=\boxed{-1}$