Помогите! * 46 cos (-pi/4) sin (-pi/6)

Question

Помогите!

* 46 cos (-pi/4) sin (-pi/6)

Answer 1

√2*46cos(-π/4)*sin(-π/6)=46√2*cos(π/4)*(-sin(π/6))=
=46√2*(√2/2)*(-1/2)=-46/2=-23