Question

Помогииииите. Прошу , молю
2cos75°*cos15°

Answer 1

$2*cos75*cos15= 2*0.5(cos60+cos90)= 1(1/2+0)=0.5$

Answer 2

$2cos75*cos15=2cos75sin75=2sin75cos75=sin2*75=sin150$$=sin30= \frac{1}{2}$