谈万能公式的“万能”应用
1997
三角公式:sina=(2tg(a/2))/(l+tg~2(a/2)),cosa=(1-tg~2(a/2))/(1+tg~2(a/2)),tga=(2tg(a/2))/(1-tg~2(a/2)),叫万能置换公式,简称万能公式。之所
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