A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

marigirl

  • one year ago

Can you please explain.. integrate 2 cos^2(x)

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

    probs a good idea to use trig identities

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

    \[\cos(2x)=2\cos ^{2}(x)-1\]

  3. marigirl
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    so then i have: 2 cos^2(x)=cos(2x)+1

  4. marigirl
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    when i integrate that I get sin(2x)/2 + x....... the ans says sin(x)cos(x)+x

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

    use trig identities for sin(2x)

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

    sin(2x) = 2sin(x)cos(x)

  7. marigirl
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    thanks!

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

    : )

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

    http://www.purplemath.com/modules/idents.htm

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

    probs a good idea to have a cheat sheet by your side when you do these problems

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

    cheat sheet of trig identities...

  12. marigirl
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    even the cheat sheet is complicated :(

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

    not if you know what you are looking for! if you find it hard to integrate something and its not your basic cosx sin(x) etc...then most likely its a trig identity you need to use to replace it

  14. marigirl
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    or i just need to do more problems! haha

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

    yep, repitition and u will be a gun

  16. marigirl
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    thanks for that website link!

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

    np : )

  18. 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.