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Portable Network Graphic  |  1987-12-30  |  2.8 KB  |  512x342  |  4-bit (3 colors)
   ocr: sum of two trignometric functions sin X + sin y - 2 sin tix+y)costox-y) sin - X - sin y = 2 2cosi(x+y) sin 2(x-y) product of two trignometric functions sin X sin y = tcoste-p-tosteey) sin: X cosy =t - - sin - (x-y)+2 sin - (x+y) cosxcosy -yoste-p.tcosteey table of contents