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Plot {sin(x)-(x-0.1666666645x^3+0.008333198583x^5-0.0001971967922x^7),atan(x)-(x-0.3333333333x^3+0.199991241x^5-0.14251795x^7+0.1063829787x^9-0.0616468x^11)},x=-pi/6..pi/6
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