help! voi bai kho wa minh khong bik giai!

N

nhok_can

ĐK; can 2 -2sinx#0
khi đó:
2(cos^2x +sin^2x)-3cos^2xsin^2x .(cos^2x+sin^2x)-sinxcosx=0
2-6cos^2xsin^2x-sinxcosx=0
2-3sin^22x-(sin2x/2)=0
6sin^22x+sin2x-4=0 . đây là ptb2 với sin^2 x
 
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