Question

Решите уравнение: Тема: cos x=a
$cos(2x+ frac{ pi П}{4}) =0$

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