若tana=½,则cos(2a+¥/2)等于多少?
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若tana=½,则cos(2a+¥/2)等于多少?
若tana=½,则cos(2a+¥/2)等于多少?
若tana=½,则cos(2a+¥/2)等于多少?
tana=½,
cos(2a+¥/2)
=cos2a
=(1-tan^2a)/(1+tan^2a)
=3/5