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((cos(x)-4)/(1-sin(x)))'The calculation above is a derivative of the function f (x)
((cos(x)-4)'*(1-sin(x))-((cos(x)-4)*(1-sin(x))'))/((1-sin(x))^2)
(((cos(x))'+(-4)')*(1-sin(x))-((cos(x)-4)*(1-sin(x))'))/((1-sin(x))^2)
(((-4)'-sin(x))*(1-sin(x))-((cos(x)-4)*(1-sin(x))'))/((1-sin(x))^2)
((0-sin(x))*(1-sin(x))-((cos(x)-4)*(1-sin(x))'))/((1-sin(x))^2)
(-sin(x)*(1-sin(x))-((cos(x)-4)*(1-sin(x))'))/((1-sin(x))^2)
(-sin(x)*(1-sin(x))-((cos(x)-4)*((-sin(x))'+(1)')))/((1-sin(x))^2)
(-sin(x)*(1-sin(x))-((cos(x)-4)*(cos(x)+(1)')))/((1-sin(x))^2)
(-sin(x)*(1-sin(x))-((cos(x)-4)*(0-cos(x))))/((1-sin(x))^2)
(-sin(x)*(1-sin(x))-((cos(x)-4)*(-cos(x))))/((1-sin(x))^2)
(cos(x)*(cos(x)-4)-((1-sin(x))*sin(x)))/((1-sin(x))^2)
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