Question

sin 60° × cos 150° va rog

Answer 1

sin 60 =$\frac{ \sqrt{3} }{2}$

cos 150= cos(90+60)= cos90cos60 + sin90sin60 = 0 + 1*$\frac{ \sqrt{3} }{2}$ = $\frac{ \sqrt{3} }{2}$

sin60 * cos 150 = $\frac{ \sqrt{3} }{2}$ * $\frac{ \sqrt{3} }{2}$ = 3/4

Answer 2

Cos 150=- rad din 3 supra 2
Sin 60=Rad din 3 supra 2
Rad. Din 3/2 x (- rad. Din 3/2)=-3/4