1/ $$8cos^{3}x - sin^{2}3x - 6sinx + sin^{2}x -2 = 0$$
2/ $sin^{2}2x - sin^{2}8x = sin(\frac{17\pi }{2} + 10x)$
3/ $$4(sinx.cos^{2}x+\cos x\sin^2x)+sin^{3}2x=1$$
1/ $$8cos^{3}x - sin^{2}3x - 6sinx + sin^{2}x -2 = 0$$
2/ $sin^{2}2x - sin^{2}8x = sin(\frac{17\pi }{2} + 10x)$
3/ $$4(sinx.cos^{2}x+\cos x\sin^2x)+sin^{3}2x=1$$
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