Show that sin(A+B)=sinAcosB+sinBcosA...

Question

diagram can be use if necessary????

Answer 1

In google type :

Prove that sin(A+B)

When you see list of results click on :

Proof of the sum and difference formulas. - The Math Page

You will see proof.

Answer 2

or

look at this video, very simple explanation:

https://www.youtube.com/watch?v=4K6xr8hjkTw