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If alpha + beta + gamma =2pi, then...

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(gamma/2)=-tan(alpha/2)+tan(beta/2)+tan(gamma/2)`

C

`tan(alpha/2)+tan(beta/2)+tan(beta/2)tan(gamma/2)+tan(gamma/2)tan(alpha/2)=1`

D

`tanalphatanbeta+tanbetatangamma+tangammatanalpha=1`

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