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(20*ln(8-x))'The calculation above is a derivative of the function f (x)
(20)'*ln(8-x)+20*(ln(8-x))'
0*ln(8-x)+20*(ln(8-x))'
0*ln(8-x)+20*(1/(8-x))*(8-x)'
0*ln(8-x)+20*(1/(8-x))*((-x)'+(8)')
0*ln(8-x)+20*((8)'-1)*(1/(8-x))
0*ln(8-x)+20*(0-1)*(1/(8-x))
0*ln(8-x)+20*(-(8-x)^-1)
20*(-(8-x)^-1)
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