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∫ 4/x dx

= 4 ∫ 1/x dx

= 4ln(x) + C

This is true for three reasons:

  1. the derivative of the term ln(x) is equal to 1/x
  2. 4 is a constant factor of the term, and can be moved out of the integral
  3. C is an unknown constant, because we're looking at an indefinite integral

You can confirm this by taking the derivative of 4ln(x), which gives you 4/x, the original term.

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Q: What is the antiderivative of 4 divided by x and why?
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