SOLUTION: Prove that sin(alpha+beta)= sin alpha cos beta+cos alpha sin beta I have no idea how to prove this. Please help!

SOLUTION: Prove that sin(alpha+beta)= sin alpha cos beta+cos alpha sin beta I have no idea how to prove this. Please help!

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Question 843799: Prove that sin(alpha+beta)= sin alpha cos beta+cos alpha sin beta
I have no idea how to prove this. Please help!
Answer by richard1234(7193) (Show Source): You can put this solution on YOUR website!
The shortest way is to substitute

and

and prove it algebraically. See the following article:

http://mathworld.wolfram.com/TrigonometricAdditionFormulas.html
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