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You are not logged in. #1 20130725 05:42:42
trignometryFrom common trigonometric formulas, I know that #2 20130726 04:24:15
Re: trignometryhi hill0093 http://www.sosmath.com/trig/prodform/prodform.html So it works because the amplitudes are the same. I'm fairly certain there's no formula when the amplitudes are different. There might be one when one amplitude is a simple factor of the other. Bob You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei 