Recent content by jtblizard

We also have the difference property for Cosine: cos(A-B)=cos(A)cos(B)+sin(A)sin(B) and we have that same thing written with x instead of A and once with x instead of A and with y-pi/2 instead of B. The things listed under relevant equations are the things we proved in class. Once, we used a...

Homework Statement We are supposed to prove that sin(x+y) = cos(x)sin(y) + sin(x)cos(y) Homework Equations cos(A-pi/2) - sin(A) sin(pi/2 - A) = Cos(A) sin(A-pi/2) = -cos(A) The Attempt at a Solution We had to prove all of the relevant equations but were allowed to work in groups...