已知tan=1/2,求1-cos2a/sinacosa,
人气：296 ℃ 时间：2020-05-03 12:59:40
解答
1-cos2a/sinacosa=1-2(cos2a/2sinacosa)
=1-2(cos2a/sin2a)
=1-2cot2a
tana=0.5,tan2a=2tana/(1-tana*tana)=4/3
cot2a=3/4
所以,1-cos2a/sinacosa=1-3/2=-1/2
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