ПОМОГИТЕ ПЖ! sin^2(x)+cos2x+cos^2(x)=0

Question

ПОМОГИТЕ ПЖ! sin^2(x)+cos2x+cos^2(x)=0

Answer 1

cos^2x+sin^2x=1

1+cos2x=0

1+2cos^2x-1=0

2cos^2x=0

cos^2x =0

cosx=0