Shorthand Combined Functions I was doing some investigation into trig functions using compound angles recently, and noticed that the results are really long and tedious to write: $$ cos(A+B) = cosAcosB - sinAsinB\\ cos(A-B) = cosAcosB + sinAsinB\\ sin(A+B) = sinAcosB + sinBcosA\\ sin(A-B) = sinA...
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