Learn why sin(A+B)=sinAcosB+cosAsinB with this elegant proof…

**Like this proof? Why not check out this page…**

How to prove that sin(A-B)=sin(A)cos(B)-cos(A)sin(B) geometrically

Learn why sin(A+B)=sinAcosB+cosAsinB with this elegant proof…

**Like this proof? Why not check out this page…**

How to prove that sin(A-B)=sin(A)cos(B)-cos(A)sin(B) geometrically