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(ln(ctg(3*x)))'The calculation above is a derivative of the function f (x)
(1/ctg(3*x))*(ctg(3*x))'
(1/ctg(3*x))*(-(3*x)'/((sin(3*x))^2))
(1/ctg(3*x))*((-((3)'*x+3*(x)'))/((sin(3*x))^2))
(1/ctg(3*x))*((-(0*x+3*(x)'))/((sin(3*x))^2))
(1/ctg(3*x))*((-(0*x+3*1))/((sin(3*x))^2))
(1/ctg(3*x))*(-3/((sin(3*x))^2))
(-3/((sin(3*x))^2))/ctg(3*x)
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