SOLUTION: Hello tutor, How do I prove this identity? (sinA+cosA)(sinB+cosB)= sin(A+B)+cos(A-B) Thanks

SOLUTION: Hello tutor, How do I prove this identity? (sinA+cosA)(sinB+cosB)= sin(A+B)+cos(A-B) Thanks

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Question 720163: Hello tutor, How do I prove this identity?
(sinA+cosA)(sinB+cosB)= sin(A+B)+cos(A-B)

Thanks
Answer by lynnlo(4176) (Show Source): You can put this solution on YOUR website!
(sinA+B)+cos(a-b)=(sinA+cosA)(sinB+cosB)
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