If cos A=3/5,cos B =4/5,find the value of cos(A-B)/2
2 answers
wondering if this is 1/2 *cos(A-B), or cos ((A+B)/2)
probably the latter, as the previous post used half-angle formula.
So, eku, I guess that gives a clue to this one, too, eh?
So, eku, I guess that gives a clue to this one, too, eh?