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

mathnoob1 Group Title

show cos2x = 1 - tan^2 (x) / 1 +tan^2 (x)

  • one year ago
  • one year ago

  • This Question is Closed
  1. Nikhil619 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    do u know how to start?

    • one year ago
  2. mathnoob1 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    |dw:1359466433151:dw|

    • one year ago
  3. mathnoob1 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    |dw:1359466643501:dw|

    • one year ago
  4. Nikhil619 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    Umm...dont do that...u'll only get cos2x=1...

    • one year ago
  5. Nikhil619 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    what is tanx=?i.e what can tanx be written as?

    • one year ago
  6. mathnoob1 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    sinx/cosx?

    • one year ago
  7. Nikhil619 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    yeah good..so tan^2x = sin^2 x/cos^2 x ?

    • one year ago
  8. mathnoob1 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    ya

    • one year ago
  9. Nikhil619 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    so nw substitute...and tell me what u get..

    • one year ago
  10. mathnoob1 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    1-(sin(^2)x/cos(^2)x / 1+(sin(^2)x/cos(^2)x ?

    • one year ago
  11. Nikhil619 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    take lcm..

    • one year ago
  12. Nikhil619 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    Simplify more...

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

    i hope dis helps

    • one year ago
    1 Attachment
  14. Nikhil619 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    @mathnoob1 u got it?

    • one year ago
  15. mathnoob1 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    do we use tan^2+1=sec^2 and 1+cot^2 =csc^2 for proving?

    • one year ago
  16. Nikhil619 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    U can use any Identity for proving but here as far as I know only this will work...

    • one year ago
  17. mathnoob1 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    any tips to know which identity fit most?

    • one year ago
  18. Nikhil619 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    there aren't any methods or anything..see u have 2 sides of a proof right..one side will be some complicated thing...while the other will probably be sumthin u know the direct equation for like here cos2x=cosx-sinx...this u already know...so try converting the complicated thing in terms of the other side equation....

    • one year ago
  19. mathnoob1 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    ok

    • one year ago
  20. mathnoob1 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    i got it cos2x/1 = cos2x

    • 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.