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OpenStudy (anonymous):
sin(x + y) + sin(x - y) = 2 sin x cos y
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OpenStudy (gorv):
expand the formulas
OpenStudy (gorv):
sin(x+y)=sinx*cosy+siny*cosx sin(x-y)=sinx*cosy-siny*cosx
OpenStudy (gorv):
=sinx*cosy+siny*cosx+sinx*cosy-siny*cosx just do the addition and substraction
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