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

Spectrum Group Title

tan^2 x = 1-cos2x/ 1+ cos2x true or false?

  • one year ago
  • one year ago

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

    That would be true. It' an identity.

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

    It's not an identity. Does tan^2x = 1-(cos2x/1)? I'm certain it doesn't. It does, however, equal to (1-cos2x)/2. This is an example of a half-angle identity.

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

    er....er

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

    \[\frac{ 1-\cos 2x }{ 1+\cos 2x }=\frac{ 1-(1-2\sin^2x) }{ 1+(2\cos^2x-1) }=\frac{ 2\sin^2x }{2\cos^2x }=\tan^2x\]

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

    so its true.

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

    um 0.0 :/

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

    something wrong?

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

    you guys are confusting me 0.o true or no?

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

    the first i did was to use the double angle formula for sine and cosine. then it was simplified, then since the ratio of sine and cosine is tangent, then the next step is obvious.

    • 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.