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.
Show that sin(A+B)=sinAcosB+sinBcosA...
diagram can be use if necessary????
2 answers
or
look at this video, very simple explanation:
https://www.youtube.com/watch?v=4K6xr8hjkTw
look at this video, very simple explanation:
https://www.youtube.com/watch?v=4K6xr8hjkTw