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sinA+sinB=a & cosA+cosB=b Prove that- sin(A+B)=(2ab)/(a²+b²)

sinA+sinB=a & cosA+cosB=b
Prove that- sin(A+B)=(2ab)/(a²+b²)

Grade:11

1 Answers

Vikas TU
14149 Points
6 years ago
Apply sinc + sind and 
cosc + cosd forulae:
and divide them u would get the relation of tan in terms of a and b.
And  then  after find sin(A+B) taking lhs and prove it for RHS.

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