fix error in polygonzugverfahren image, add tikz math library to lecture cls
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@@ -27,7 +27,7 @@
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\RequirePackage{environ}
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\RequirePackage{stackrel}
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\usetikzlibrary{quotes, angles}
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\usetikzlibrary{quotes, angles, math}
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\pgfplotsset{compat=1.15} % or \pgfplotsset{compat=newest}
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\geometry{
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