Question

УПРОСТИТЕ ВЫРАЖЕНИЕ!!!!!!!!!

Answer 1

2sin(3pi+x/2)cos(4pi-x/2)=-2sin(x/2)cos(x/2)=-sin(x)
При x = 30 -sin(30)=-1/2

Answer 2

$2Sin(3 \pi + \frac{x}{2})Cos(4 \pi - \frac{x}{2})=2Sin( \pi + \frac{x}{2})Cos \frac{x}{2} =-2Sin \frac{x}{2} Cos \frac{x}{2}=$$-Sinx\\\\-Sin30 ^{o}=- \frac{1}{2}$