化简sina*cosa(tana+1/tana)

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化简sina*cosa(tana+1/tana)
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化简sina*cosa(tana+1/tana)
化简sina*cosa(tana+1/tana)

化简sina*cosa(tana+1/tana)
sina*cosa(tana+1/tana)
=sinacosa(sin²a+cos²a)/(sinacosa)
=1

sina*cosa(tana+1/tana)
=sinacosa(sina/cosa+cosa/sina)
=sina*sina+cosa*cosa
=1

sina cosa(tan a+1/tana)
=sina cosa (sina/cosa+cosa/sina)
=sin²a+cos²a
=1