1) 2sin2x+3sin²x=0
2) 21sin2x+2sin²x+8=0

4sinxcox+3sin²x=0|:cos^2x4tgx+3tg^2x=0tgx=a3a^2+4a=0a1=0? a2=-4/3tgx=0x=Пntgx=-4/3x=arctg(-4/3)+Пk