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If sinα+sinβ=a and cosα+cosβ=b, show that (i)sin(α+β)=2aba2+b2 (ii)cos(α+β)=b2−a2b2+a2

Answer» If sinα+sinβ=a and cosα+cosβ=b, show that
(i)sin(α+β)=2aba2+b2
(ii)cos(α+β)=b2a2b2+a2


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