Question

помогите пожалуйста)

Answer 1

$3cos^2x-2sin2x+sin^2x=0 \ 3cos^2x-4sinxcosx+sin^2x=0 \ tg^2x-4tgx+3=0 \ D_1=4-3=1 \ tgx=2+1=3 \ x=arctg3+pi n,n in Z \ tgx=2-1=1 \ x= frac{pi}{4}+pi n,n in Z$