If (A + B + C) = 90°, then what is the value of sin (A / 2) sin [(180 – McqOptions

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1.	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?
A.	1 / 2
B.	1
C.	1 / √2
D.	√3 / 2
Answer» D. √3 / 2

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