求证:(a^2/sin^2 x )+(b^2/cos^2 x)大于等于a+b)^2快
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求证:(a^2/sin^2 x )+(b^2/cos^2 x)大于等于a+b)^2快
求证:(a^2/sin^2 x )+(b^2/cos^2 x)大于等于a+b)^2
快
求证:(a^2/sin^2 x )+(b^2/cos^2 x)大于等于a+b)^2快
左右两边展开移项等价于证明(把右边的a^2+b^2移到左边合并同类项)
a^2 cos^2 x/sin^2 x+ b^2 sin^2 x/cos^2 x>=2ab
上式用A^2+B^2>=2AB即可得到
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