Question

Calcule: sen (

π

+

π/3 )

Answer 1

Use a fórmula do seno da soma de dois ângulos:

$sen(\alpha+\beta)=sen \alpha.cos \beta+sen \beta.cos \alpha\\ \\ sen(\pi+\frac{\pi}{3})=sen\pi.cos\frac{\pi}{3}+sen\frac{\pi}{3}.cos\pi=0.\frac{\sqrt3}{2}+(-1).\frac{1}{2}=-\frac{1}{2}$