Question

Решите уравнения: а) cos x/15=-√3/2 б) sin(x+Пи/6)=√2/2

Answer 1

x/15=+-5π/6+2πn
x=+-25π/2+30πn,n∈z

x+π/6=π/4+2πk U x+π/6=3π/4+2πm
x=π/12+2πk,k∈z U x=7π/12+2πm,m∈z