Question

Решите уравнение: Тема: cos x=a

Answer 1

Cos(2x+π/4)=0
2x+π/4=π/2+πn,n∈Z
2x=-π/4+π/2+πn,n∈Z
2x=π/4+πn,n∈Z
x=π/8+πn/2,n∈Z

Answer 2

Cos(2x+pi/4)=0
2x+pi/4=pi/2+pi*k
2x=pi/2+pi*k-pi/4
2x=pi/4+pi*k
x=pi/8+k*pi/2