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((x*ln(x))/cos(x))'The calculation above is a derivative of the function f (x)
((x*ln(x))'*cos(x)-(x*ln(x)*(cos(x))'))/((cos(x))^2)
(((x)'*ln(x)+x*(ln(x))')*cos(x)-(x*ln(x)*(cos(x))'))/((cos(x))^2)
((1*ln(x)+x*(ln(x))')*cos(x)-(x*ln(x)*(cos(x))'))/((cos(x))^2)
((1*ln(x)+x*(1/x))*cos(x)-(x*ln(x)*(cos(x))'))/((cos(x))^2)
((ln(x)+1)*cos(x)-(x*ln(x)*(cos(x))'))/((cos(x))^2)
((ln(x)+1)*cos(x)-(x*ln(x)*(-sin(x))))/((cos(x))^2)
((ln(x)+1)*cos(x)+x*sin(x)*ln(x))/((cos(x))^2)
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