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In a triangle ABC, (sin A+ sin B+ sin C)...

In a triangle ABC, `(sin A+ sin B+ sin C) (sin A+sin B-sinC)= 3 sin A sin B, ` then which one of the following is correct ?

A

`B=(pi)/(2)`

B

`C=(pi)/(3)`

C

`C=(pi)/(9)`

D

none of these

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The correct Answer is:
B
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