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lovelycat_handoi95

[TEX]sin^2x+\frac{1}{4}sin^23x=sinxsin^23x[/TEX]
[TEX]\Leftrightarrow 4sin^2x-4sinxsin^23x+sin^43x+sin^23x-sin^43x=0[/TEX]

[TEX]\Leftrightarrow (2sinx-sin^23x)^2+sin^23x.cos^23x=0[/TEX]

[TEX]\Leftrightarrow \left{2sinx-sin^23x=0\\sin^23x.cos^23x=0[/TEX]

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