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