Hi! Thank you very much for your help---

I'm not sure what the answer to this is; how do I solve?

Find antiderivative of
(1/(x^2))[sec(1/x)][tan(1/x)]dx

I did integration by parts and got to
(1/(x^2))[sec(1/x)] + 2*[antiderivative of (1/(x^3))(sec(1/x))dx]

1 answer

Integration by parts is the same as any other tool. It's just a tool. You can go around in circles with it... unless you know where you're going.

For this particular problem, I propose to use another tool, substitution.

Did you notice there is the factor (1/x²) at the beginning? What would ∫(1/x²)dx give? ∫-d(1/x).

So the integral becomes:
I=∫(1/(x^2))[sec(1/x)][tan(1/x)]dx
=∫[sec(1/x)][tan(1/x)]d(1/x)
=∫sec(y)tan(y)dy
= ... +C

Do remember, however, if and when you have to evaluate a definite integral, the limits have to correspond to the integration variable, which in this case is (1/x).
Similar Questions
  1. Match the term that best matches the definition. (1 point)Serve - [answer] Ground Stroke - [answer] Love - [answer] Let -
    1. answers icon 1 answer
  2. Fill in the blanks.Feature Function f(x) = b* Function f(x) = a • b* y-intercept •-----. 1 Answer • Answer Other known
    1. answers icon 1 answer
  3. Use the table to answer the question.Which of the following rows in the table represents a correct pairing of obligatory and
    1. answers icon 1 answer
  4. Round each decimal number to the nearest hundredth. 1. 8.456 answer 8.4602. 3.262 answer 3.260 3. 8.902 answer 8.900 4. 6.551
    1. answers icon 3 answers
more similar questions