Question

$if \: a + b + c = prove \: that \: \cos(a) + sin(b) - cos(c) = 4 \cos(a \div 2) \times \cos(b \div 2 \times \sin(c \div 2) - 1$

Answer 1

hey mate I think the question is incomplete

as a+b+c=not given

Answer 2

hey sista ur que is incomplete ....the value of a + b + c is missing