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(ln(7*x^2))'The calculation above is a derivative of the function f (x)
(1/(7*x^2))*(7*x^2)'
(1/(7*x^2))*((7)'*x^2+7*(x^2)')
(1/(7*x^2))*(0*x^2+7*(x^2)')
(1/(7*x^2))*(0*x^2+7*2*x^(2-1))
(1/(7*x^2))*(0*x^2+7*2*x)
2*x^-1
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