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Portable Network Graphic  |  1998-07-22  |  2.1 KB  |  237x147  |  1-bit (2 colors)
   ocr: Ditrerence Formulas - - sin. x-siny=2cos 2 - - - (relin(s-) 2 - - cosx-cosy=-2sin (xtyl.(x - - sin - - y 2 2