tan=2,则(sin²α+sin2α)/(cos²α+2sin²α)的值为多少
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tan=2,则(sin²α+sin2α)/(cos²α+2sin²α)的值为多少
tan=2,则(sin²α+sin2α)/(cos²α+2sin²α)的值为多少
tan=2,则(sin²α+sin2α)/(cos²α+2sin²α)的值为多少