(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

We are supposed to prove that sin(x+y) = cos(x)sin(y) + sin(x)cos(y)

2. Relevant equations

cos(A-pi/2) - sin(A)

sin(pi/2 - A) = Cos(A)

sin(A-pi/2) = -cos(A)

3. The attempt at a solution

We had to prove all of the relevant equations but were allowed to work in groups and now that I am alone, I am just having trouble pushing off and getting started. If someone can give me a push in the right direction, I feel like I will be able to finish it on my own. Thank you in advance.

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# Homework Help: Proof of additive property for sine

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