A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • one year ago

I need explanation...

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

    |dw:1439109817446:dw|

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

    know the double angle formula? cos 2x = ... ?

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

    in terms of cos^2 x

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

    No i dont

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

    ok, its good to know all variations of cos 2x formula I will write the 3 most important ones for you \(\Large \cos 2x = \cos^2 x - \sin^2 x\) \(\Large \cos 2x = 2\cos^2 x - 1\) \(\Large \cos 2x = 1-2\sin^2 x \)

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

    we need to use the 2nd one for our problem try to get expression for cos^2 x from it

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

    oh alright we are allowed to have a formula page. It says cos^2 x =1+cos2/2

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

    exactly, that you'll get from the 2nd formula, just plug that into your integral!

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

    |dw:1439110177783:dw|

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

    Alright this wasnt so bad! Thank you :)

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

    welcome ^_^

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

    |dw:1439110246947:dw|

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

    thanks cant forget the c.

  14. 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.