Here's the question you clicked on:
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.
\[sin(A+B)=sinAcosB+cosAsinB\] \[cos(A+B)=cosAcosB-sinAsinB\] \[sin(A-B)=sinAcosB-cosAsinB\] \[cos(A-B)=cosAcosB+sinAsinB\]
You can also write: \[sin(A\pm B)=sinAcosB\pm cosAsinB\] \[cos(A\pm B)=cosAcosB\mp sinAsinB\]