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-rw-r--r--buch/chapters/060-integral/experiments/rxy.maxima9
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diff --git a/buch/chapters/060-integral/experiments/rxy.maxima b/buch/chapters/060-integral/experiments/rxy.maxima
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+++ b/buch/chapters/060-integral/experiments/rxy.maxima
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+y: sqrt(a*x^2+b*x+c);
+
+F: log(x + b/(2 * a) + y/sqrt(a))/sqrt(a);
+
+f: diff(F, x);
+
+ratsimp(f);
+
+ratsimp(y*f);