Question

Sendo sen x = raiz de 3/2 , determine o valor do cos x (x é um arco do 1 quadrante)

Answer 1

$\displaystyle \sin{x}=\frac{\sqrt{3}}{2}~~\land~~\frac{\pi}{2}\geq x \geq 0~\Rightarrow~x=\frac{\pi}{3}\\\\\cos{x}=\cos{\frac{\pi}{3}}=\frac{1}{2}$