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View Full Version : cos(alpha-beta)/(sin(alpha)cos(beta))=cot(alpha)+tan(beta)

texasgal28
Apr 17, 2012, 06:43 PM
Proving Identites. Make one side equal the other.This is for a Precalculus college class.in Texas.
ebaines
Apr 18, 2012, 05:40 AM
Expand the cos(A-B) term to cos(A)cos(B)+sin(A)sin(B) and it works right out.