证明:(cota+csca-1)/(cota-csca+1)=cota+csca

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证明:(cota+csca-1)/(cota-csca+1)=cota+csca
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证明:(cota+csca-1)/(cota-csca+1)=cota+csca
证明:(cota+csca-1)/(cota-csca+1)=cota+csca

证明:(cota+csca-1)/(cota-csca+1)=cota+csca

 
 
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(cota-csca+1)*(cota+csca)
=cot^2 a-cotacsca+cota+cotacsca-csc^2 a+csca
=cota+csca-1
所以
(cota+csca-1)/(cota-csca+1)=cota+csca