Cos12°+sin42°= ..........​

Question

Cos12°+sin42°= ..........​

Answer 1

Cos12R+sin42R

Cos(12R)+sin(90r-48r)

Cos(12r)+cos(48r)

2cos(30r)cos(-18r)

2×корень3/2×cos(18r)

Корень3×cos(18r)