Asked by eku

If cos A=3/5,cos B =4/5,find the value of cos(A-B)/2
Answered by bobpursley
wondering if this is 1/2 *cos(A-B), or cos ((A+B)/2)
Answered by Steve
probably the latter, as the previous post used half-angle formula.

So, eku, I guess that gives a clue to this one, too, eh?
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