sina+cosa=1/2,
(sina+cosa)^2=1/4,
sin^2a+cos^2a+2sinacosa=1/4
1+2sinacosa=1/4,
2sinacosa=sin(2a)=-3/4
已知sina+cosa=1/2,求sina-cosa和tana+cota的值
已知sina+cosa=1/2,求sina-cosa和tana+cota的值
数学人气:174 ℃时间:2020-01-30 01:06:49
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