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12. lf in triangle ABC ,cos theta (sinB ...

12. lf in triangle ABC ,`cos theta (sinB + sinC) = sinA,` then (A) `cot^2theta/2=tanB/2tanC/2` (B) `tan^2 theta/2=tanB/2+tanC/2 `(C) `tan^2 theta/2=tanB/2tanC/2`D) `costhetacos(B-C)/2-cos(B+C)/2=0`

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