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Portable Network Graphic  |  1998-07-22  |  2.4 KB  |  252x152  |  1-bit (2 colors)
   ocr: Half-Angle Formulas I - - 11-cos X tan n=t I - 1-cosx 2 - - - V1+cos X sin - =t . - V . - - - 2 I sin A 2 tan I 1+cosx 2 1+cos . I cos-=t - - X - - 1-cos - I 2 2 tan 2 sinx