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