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« (tanθ+1)²+(cotθ+1)²=(secθ+cscθ)² • Sums of Arctangents »
October 14, 2007
正余弦有理代换（就是三角万能公式）
——RBN
the-substitution-to-make-a-rational-function-of-the-sine-and-cosine
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