A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • one year ago

Any one out there who can give me a hand doing integrals

  • This Question is Open
  1. Empty
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    \(\int\)ure, I can help probably.

  2. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    \[\int\limits_{?}^{?} \sin2x/1+\cos^2x\]

  3. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    In class, my teacher said to make the denominator = to u or p

  4. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so let p= 1+cos^2x

  5. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    dp =?

  6. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Yeah, let the bottom be your u. You will need an identity on the numerator to get the proper cancellation, though.

  7. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Take the derivative of p to get dp. Use the identity for the numerator sin 2x = 2 cos x sin x

  8. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    where did you find the identity?

  9. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    that's a double angle identity

  10. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    oh

  11. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    can you give a hint on how to get dp

  12. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    It's going to be the derivative of 1 + cos² x. Use the chain rule

  13. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    is it -2cosxsinx?

  14. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yes it is

  15. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    with dx at the end?

  16. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yes

  17. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    cool, but why? this is the stuff the confuses me

  18. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ohhhhhhhhhhhh

  19. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    because there isn't an easy rule to integrate the original problem, so we use the substitution to make it simpler

  20. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    u r the man

  21. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    lol

  22. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    The pic of Ernie is right on point too

  23. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.