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余弦公式！！！

Posted by l3160732 at 2008-06-19 21:34:20 on Problem 1675 
e1:=(x1*x2+y1*y2)/sqrt(sqr(x1)+sqr(y1))/sqrt(sqr(x2)+sqr(y2));
e2:=(x2*x3+y2*y3)/sqrt(sqr(x2)+sqr(y2))/sqrt(sqr(x3)+sqr(y3));
e3:=(x3*x1+y3*y1)/sqrt(sqr(x3)+sqr(y3))/sqrt(sqr(x1)+sqr(y1));
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