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=cos(a)+sin(a)
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=cos(a)^2 + sin(a)^2 + 2cos(a)sin(a)   ;
2cos(a)sin(a)   Îª¸ÅÂʲ¨¸ÉÉæÏî

[ Last edited by janecool on 2010-12-3 at 16:26 ]
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