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(-4*ln(2*x))'The calculation above is a derivative of the function f (x)
(-4)'*ln(2*x)-4*(ln(2*x))'
0*ln(2*x)-4*(ln(2*x))'
0*ln(2*x)-4*(1/(2*x))*(2*x)'
0*ln(2*x)-4*(1/(2*x))*((2)'*x+2*(x)')
0*ln(2*x)-4*(1/(2*x))*(0*x+2*(x)')
0*ln(2*x)-4*(1/(2*x))*(0*x+2*1)
0*ln(2*x)-4*x^-1
-4*x^-1
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