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a) $tan\dfrac{x}{2} Cosx _ Sin2x = 0$
b) $Sin^6x + 3Sin²xCosx + Cos^6x = 1$
c) $Sin³xCosx - SinxCos³x = \dfrac{\sqrt{2}}{8}$
b) $Sin^6x + 3Sin²xCosx + Cos^6x = 1$
c) $Sin³xCosx - SinxCos³x = \dfrac{\sqrt{2}}{8}$
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