化简:(1-tan4A)cos2A+tan2A(4,2,2都是上标,打不出来.)
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化简:(1-tan4A)cos2A+tan2A(4,2,2都是上标,打不出来.)
化简:(1-tan4A)cos2A+tan2A(4,2,2都是上标,打不出来.)
化简:(1-tan4A)cos2A+tan2A(4,2,2都是上标,打不出来.)
(1-tan4A)cos2A+tan2A
=(1+tan2A)(1-tan2A)cos2A+tan2A
=(1+tan2A)cos2A(1-tan2A)+tan2A
=(cos2A+tan2A*cos2A)(1-tan2A)+tan2A
=(cos2A+sin2A)(1-tan2A)+tan2A
=1-tan2A+tan2A
=1