ocr: sum of two trignometric functions sin X + sin y = 2 sin t(x+y)cos 2(x-y) sin X - sin y - 2 2 cos(x+y) sin 2(x-y) product of two trignometric functions sin X sin y - 2 COS s(x-y)-tcos(x+y) sin X cosy - - - 2 - - - sin (x-y)+t sin - - (x+y) coS X COS y - - 2 COS s(x-y)+tcos(x+y) table of contents
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