证明 tg(a/2)+ctg(a/2)=2csca
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证明 tg(a/2)+ctg(a/2)=2csca
证明 tg(a/2)+ctg(a/2)=2csca
证明 tg(a/2)+ctg(a/2)=2csca
TG(a/2)^2+1/TG(a/2)=1/COS(a/2)^2*SIN(a/2)/COS(a/2)
=1/SIN(a/2)*COS(a/2)=2csca