Question

решим уравнение 2sin²x +sin x-1=0

Answer 1

$sin x=t,;sin^2x=t^2,;tin[-1;;1]\2t^2+t-1=0\D=1+4cdot2=9\t_1=1\t_2=-2;-;He;nogx\sin x=1Rightarrow x=fracpi2+2pi n,;ninmathbb{Z}$