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if sin α + sin β = a and cos α + cos β = b , then the value of cos ( α + β ) is if sinα+sinβ=a and cosα+cosβ=b, then the value of cos(α+β) is
sin
what u have to do is name these equ as 1 and 2 now make squares of the equ and subtract themthen by simplying the obtained equ
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