Question

помогите ,пожалуйста
cos^2(x)+3sin^2(x)=2

Answer 1

(1+cos2x)/2+3(1-cos2x)/2=2
1+cos2x+3-3cos2x=4
2cos2x=0
cos2x=0
2x=π/2+πn
x=π/4+πn/2,n∈z