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sin(C +B )/2
Cos ( π/2 - (c +b)/2)
we know that
sum of angle of triangle = 180
so
A + B + C= 180
B + C = π - A
or
A = π - (B + C)
so
Cos ( π - (c+ b))/2
Cos (A/2)
Hence
LHS = RHS
proved
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