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consider the following integral:

⨜cot(7x) dx

Find a substitution to rewrite the integrand as 1/7u du
u=?
du=(?)dx

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2 answers
  1. u = sin(7x)
    du = 7cos(7x)
    Now you have
    ∫ 1/7 du/u

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  2. Thank you so much!

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