1.

A+B + C = 2S implies sin S + sin (S -A) + sin (S - B) - sin (S - C) =

Answer»

`4COS""(A)/(2) .cos ""(B)/(2) .cos""(C )/(2)`
`4cos ""(A)/(2).cos""(B)/(2) .sin""(C )/(2)`
`4 cos ""(A)/(2).sin""(B)/(2) .cos ""(C )/(2)`
`4 sin "" (A)/(2) .sin ""(B)(2) .sin""(C )/(2)`

ANSWER :B


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