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If alpha+beta+gamma=2pi,\ then- a.tan...

If `alpha+beta+gamma=2pi,\ ` then- a.`tanalpha/2+(tan\ beta)/2+tangamma/2=tanalpha/2tanbeta/2tangamma/2` b. `tanalpha/2+tanbeta/2+tan"(beta/2)tangamma/2=tangamma/2tanalpha/2=1` c.`tanalpha/2+t a nbeta/2+tangamma/2=tanalpha/2tanbeta/2tangamma/2` d.`tan(alpha/2)tan(beta/2) +tan(gamma/2)tan(beta/2) +tan(gamma/2)tan(alpha/2) =0`

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