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