Question:

the value of ∫\(\frac{dx}{x(1+log\,x)^3}\) is _______

Updated On: Apr 15, 2024
  • \(-\frac{x}{(1+log\,x)^2}\)\(+c\)
  • \(-\frac{x}{(1+log\,x)^2}+c\)
  • \(-\frac{1}{2(1+log\,x)^2}+c\)
  • \(\frac{2}{(1+log\,x)^2}+c\)
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The Correct Option is C

Solution and Explanation

The correct option is (C): \(-\frac{1}{2(1+log\,x)^2}+c\)
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Concepts Used:

Integration by Parts

Integration by Parts is a mode of integrating 2 functions, when they multiplied with each other. For two functions ‘u’ and ‘v’, the formula is as follows:

∫u v dx = u∫v dx −∫u' (∫v dx) dx

  • u is the first function u(x)
  • v is the second function v(x)
  • u' is the derivative of the function u(x)

The first function ‘u’ is used in the following order (ILATE):

  • 'I' : Inverse Trigonometric Functions
  • ‘L’ : Logarithmic Functions
  • ‘A’ : Algebraic Functions
  • ‘T’ : Trigonometric Functions
  • ‘E’ : Exponential Functions

The rule as a diagram: