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这个表达式是怎样得到的?

Posted by pp2788034 at 2006-04-22 21:49:21 on Problem 1254 
y:=(cos(t2)*(sin(t1)*y1-cos(t1)*x1)-cos(t1)*(sin(t2)*y2-cos(t2)*x2))/(sin(t1-t2));
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