tana=2求cos2a/(sina-cosa)的平方
tana=2求cos2a/(sina-cosa)的平方
数学人气:942 ℃时间:2020-01-28 06:56:29
优质解答
cos2a=cosa^2-sina^2=(cosa+sina)(cosa-sina) 所以题式=(cosa+sina)/(cosa-sina) 分子分母同时除以cosa得 (1+tana)/(1-tana)=-3
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