(tanx+cotx)cos²x = (要过程)
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(tanx+cotx)cos²x = (要过程)
(tanx+cotx)cos²x = (要过程)
(tanx+cotx)cos²x = (要过程)
(tanx+cotx)cos^2x
=(sinx/cosx+cosx/sinx)cos²x
=(sin²x+cos²x)*cos²x/(sinxcosx)
=1*cos²x/sinxcosx
=cosx/sinx
=cotx