1.

A,B,C are three angles of a triangle and "sin" (A+c/2)= n "sin" C/2 ("sin" C/2)/("cos"A/2 "cos"B/2)=

Answer»

`2/(n+1)`
`1/(n+1)`
`-2/(n+1)`
`1/(n+1)`

ANSWER :A


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