Can someone please help me derive the cos(alpha+beta) sin(alpha+beta)? Preferably in simple language X(

I have to be able to do this on a test tomorrow, please help me

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- Dec 7th 2008, 03:47 PMpyrosilverderive cos(alpha+beta) sin(alpha+beta)?
Can someone please help me derive the cos(alpha+beta) sin(alpha+beta)? Preferably in simple language X(

I have to be able to do this on a test tomorrow, please help me - Dec 7th 2008, 04:04 PMskeeter
here's a link that may help ...

Math Forum - Ask Dr. Math - Dec 7th 2008, 04:22 PMpyrosilver
Thanks for the link but we're supposed to derive it using matrices.

- Dec 7th 2008, 04:27 PMpyrosilver
PlanetMath: addition and subtraction formulas for sine and cosine

on one of the very back pages of googles. this is the same thing right?

i'm goign to ask a really stupid question sorry but...what is this used for?