1.

If alpha + beta + gamma = 2pi, then

Answer»

`TAN alpha/2 + tan beta/2 + tan gamma/2 = tan alpha/2 tan beta/2 tan gamma/2`
`tan alpha/2tan beta/2 + tan beta/2 tan gamma/2 + tan gamma/2 tan alpha/2=1`
`tan alpha/2 + tanbeta/2 + tan gamma/2 =-tan alpha/2 tan beta/2 tan gamma/2`
`SUM tan(alpha/2) tan(beta/2)=-1`

ANSWER :A


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