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tan2a=sin2a/cos2a 所以cos2a+tan2a.cos2a=cos2a+(sin2a/cos2a)cos2a=cos2a+sin2a =√2(sin2a*√2/2+cos2a*√2/2) =√2(sin2acosπ/4+cos2asinπ/4) =√2sin(2a+π/4)
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