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(41*x^-4)'The calculation above is a derivative of the function f (x)
(41)'*x^-4+41*(x^-4)'
0*x^-4+41*(x^-4)'
0*x^-4+41*-4*x^(-4-1)
0*x^-4+41*-4*x^-5
-164*x^-5
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