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(ln(4*x+9))'The calculation above is a derivative of the function f (x)
(1/(4*x+9))*(4*x+9)'
(1/(4*x+9))*((4*x)'+(9)')
(1/(4*x+9))*(4*(x)'+(4)'*x+(9)')
(1/(4*x+9))*(4*(x)'+0*x+(9)')
(1/(4*x+9))*(0*x+4*1+(9)')
(0+4)*(1/(4*x+9))
4/(4*x+9)
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