Question

calculati sin x,
x ∈ (0, $\frac{pi}{2}$ ) , stiind ca cos x = $\frac{1}{3}$

Answer 1

$sinx= \sqrt{1-cos^2x} = \sqrt{1- \frac{1}{9} } = \sqrt{ \frac{8}{9} }= \frac{2 \sqrt{2} }{3}$