Cho $\frac{1}{tan^{2x}}+\frac{1}{cot^{2x}}+\frac{1}{sin^{2x}}+\frac{1}{cos^{2x}}= 7.$. Tính Q=$(1+tanx)^{3}$. Biết $\frac{\prod }{2}< x < \prod$.
Tính Q=$(1+tanx)^{3}$ biết
Started By ironman, 19-06-2012 - 20:58
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