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If alpha+beta+gamma=2pi, then (a) tan(...

If `alpha+beta+gamma=2pi,` then (a) `tan(alpha/2)+tan(beta/2)+tan(gamma/2)=tan(alpha/2)tan(beta/2)tan(gamma/2)` (b)`tan(alpha/2)tan(beta/2)+tan(beta/2)tan(gamma/2)+tan(gamma/2)tan(alpha/2)=1` (c)`tan(alpha/2)+tan(beta/2)+tan(gamma/2)=-tan(alpha/2)tan(beta/2)tan(gamma/2)` (d)none of these

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