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

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


   

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) About Me  (Show Source):
You can put this solution on YOUR website!
(sinA+B)+cos(a-b)=(sinA+cosA)(sinB+cosB)