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If (A+B + C) =90^@, then what is the val...

If `(A+B + C) =90^@`, then what is the value of `sin (A/2) sin[(180-B-C)//2] + cos(A/2) sin(B+C) //2`?
यदि `(A+B + C) =90^@` है, तो `sin (A/2) sin[(180-B-C)//2] + cos(A/2) sin(B+C) //2` का मान क्या है?

A

A)`1/2`

B

B)1

C

C)`1/sqrt 2`

D

D)`sqrt3/2`

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