1.

If A+B+C= 2S , " then " sin (S-A) sin(S-B) + sinS sin(S-C)=

Answer»

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

Answer :B


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