# Trigonometry

posted by
**Karth**
.

Does anyone have a good website that shows the proofs for these equations?

sin(u+v) = sin(u)cos(v) + sin(v)cos(u)

cos(u+v) = cos(u)cos(v) + sin(v)sin(u)

Thanks!

posted by
**Karth**
.

Does anyone have a good website that shows the proofs for these equations?

sin(u+v) = sin(u)cos(v) + sin(v)cos(u)

cos(u+v) = cos(u)cos(v) + sin(v)sin(u)

Thanks!