Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

helpplease1 Group Title

Find exact value: sin(2 cos^-1(-3/11))

  • one year ago
  • one year ago

  • This Question is Closed
  1. zzr0ck3r Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    there are infinite

    • one year ago
  2. helpplease1 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    how so?

    • one year ago
  3. zzr0ck3r Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    cos(x) = -3/11 has infinite solutions

    • one year ago
  4. zzr0ck3r Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    forget what I said, they just want the one

    • one year ago
  5. zzr0ck3r Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    cos^(-1)(-3/11) = 105.8 now sin(105.8) = .9622

    • one year ago
  6. zzr0ck3r Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    4sqrt(7)/11

    • one year ago
  7. helpplease1 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    thank you!

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

    \[put \cos^{-1} \left( \frac{ -3 }{ 11 } \right)=x\] \[\cos x=\frac{ -3 }{ 11 }\] hence x lies in second or third quadrant. \[\sin x=\sqrt{1-\left( \frac{ -3 }{11 } \right)^{2}}=\sqrt{1-\frac{ 9 }{121 }}=\frac{ \sqrt{112} }{11 }\] sin x can be positive or negative according as x lies in second or third quadrant. plug in sin 2x= 2 sin x cos x

    • one year ago
  9. helpplease1 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    wow thank you so much!

    • one year ago
  10. surjithayer Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    yw

    • one year ago
  11. zzr0ck3r Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    woops I didn't notice the 2

    • one year ago
    • Attachments:

See more questions >>>

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.