[Toán 11]Gợi ý giúp !!!

C

connguoivietnam

3-4sin^2x=2cos2x(1+2sinx)
3-16sin^xcos^x=2cos2x(1+2sinx)
3-16sin^x(1-sin^2x)=2cos2x(1+2sinx)
3-16sin^2x+16sin^4x=2cos2x(1+2sinx)
(4sin^2x-1)(4sin^2x-3)=2cos2x(1+2sinx)
(2sinx-1)(2sinx+1)(4sin^2x-3)=2cos2x(1+2sinx)
(2sinx+1)((2sinx-1)(4sin^2x-3)-2cos2x) =0
 
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