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if sinA +sinB=a AND cosA+ cosB=b then prove that sin(A+B)=( 2ab) /(a 2 +b 2 )

if sinA +sinB=a  AND cosA+ cosB=b then prove that            sin(A+B)=(2ab)/(a2+b2)

Grade:11

1 Answers

Deepak Kumar Shringi
askIITians Faculty 4405 Points
3 years ago
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