(tanX+cotX)cos²X

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(tanX+cotX)cos²X
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(tanX+cotX)cos²X
(tanX+cotX)cos²X

(tanX+cotX)cos²X
Hi1359天空之城
=(sinx/cosx+cosx/sinx)cos²X
=(sin²x+cos²x)cosx/sinx
=cosx/sinx
=cotx
o(∩_∩)o

原式=(sinx/cosx+cosx/sinx)cos²x
=[(sin²x+cos²x)/sinxcosx]cos²x
=(1/sinxcosx)cos²x
=cos²x/sinxcosx
=cosx/sinx
=cotx