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If the bisector angle A of the triangle ...

If the bisector angle A of the triangle ABC makes an angle `theta` with BC, then `sin theta=`

A

`"cos" (B-C)/(2)`

B

`"cos" (B+C)/(2)`

C

`cos(B+(A)/(2))`

D

`cos(C+(A)/(2))`

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The correct Answer is:
A
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