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(ctg(90*x))'The calculation above is a derivative of the function f (x)
-(90*x)'/((sin(90*x))^2)
(-((90)'*x+90*(x)'))/((sin(90*x))^2)
(-(0*x+90*(x)'))/((sin(90*x))^2)
(-(0*x+90*1))/((sin(90*x))^2)
-90/((sin(90*x))^2)
-90/((sin(90*x))^2)
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