化简(1/sinα+1/tanα)(1-cosα)=

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化简(1/sinα+1/tanα)(1-cosα)=

化简(1/sinα+1/tanα)(1-cosα)=
化简(1/sinα+1/tanα)(1-cosα)=

化简(1/sinα+1/tanα)(1-cosα)=
(1/sinα+1/tanα)(1-cosα)=(1/sinα+cosα/sinα)(1-cosα)=1-cos^2α/sinα=sin^2α/sinα=sinα

(1/sinα+cosα/sinα)(1-cosα)=(1+cosα)(1-cosα)/sinα=[1-cos^2(α)]/sinα=sinα

(1/sinα+1/tanα)(1-cosα)
=[1/sinα+1/(sinα/cosα)](1-cosα)
=[1/sinα+cosα/sinα](1-cosα)
=[(1+cosα)/sinα](1-cosα)
=(1+cosα)(1-cosα)/sinα
=(1-cos²α)/sinα
=sin²α/sinα
=sinα

(1/sina+cosa/sina)(1-cosa)=[1-(cosa)^2]/sina=sina