## ajprincess Note to the viewers: This is nt a question. I made a mistake in certain portion of my previous post which was a tutorial on trigonometric identities and this is the correct version of it. one year ago one year ago

1. ajprincess

jst a moment then.

2. ajprincess

$sin(A+B)=sinAcosB+cosAsinB$ $cos(A+B)=cosAcosB-sinAsinB$ $sin(A-B)=sinAcosB-cosAsinB$ $cos(A-B)=cosAcosB+sinAsinB$

3. Valpey

You can also write: $sin(A\pm B)=sinAcosB\pm cosAsinB$ $cos(A\pm B)=cosAcosB\mp sinAsinB$