Question

Решите уровнения
4cos²x-sinxcosx=0

Answer 1

$4cos^2x-sin xcos x=0\cos x(4cos x-sin x)=0\cos x=0Rightarrow x=fracpi2+pi n\4cos x-sin x=0\4cos x=sin x\tg x=4\x=arctg4+pi  n,;ninmathbb{Z}$