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(X^3-(4*x)-15)'The calculation above is a derivative of the function f (x)
(X^3-(4*x))'+(-15)'
(X^3)'+(-(4*x))'+(-15)'
4*(x)'+(4)'*x+(-15)'+0
4*(x)'+0*x+(-15)'+0
0*x+4*1+(-15)'+0
0-4
-4
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