Question

Determinati sin 22 de grade si 30'

Answer 1

sin a / 2 =$\sqrt{ \frac{1-cos \alpha }{2} }$

sin 22°30' = √$\frac{1-cos45*}{2}$ = $\sqrt{ \frac{1- \frac{ \sqrt{2} }{2} }{2}$ = $\frac{ \sqrt{2- \sqrt{2} } }{2}$