Giúp em 2 câu này đi ạ huhu
h) sin^3.x + cos^3.x = cos2x
l) sinx(1+ cosx) = 1+ cosx + cos^2.x
Giúp em 2 câu này đi ạ huhu h) sin^3.x + cos^3.x = cos2x l) sinx(1+ cosx) = 1+ cosx + cos^2.x
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