A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • 4 years ago

hey what is tan(45+a) equal to?

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

    how does this (1 - tan^2a)/(1+tan^2a) cos 2a?

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

    (1 - tan^2a)/(1+tan^2a) = cos 2a?

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

    \[ \tan (a + b) = \frac{\tan a + \tan b}{1 - \tan a \tan b}\] Hmm that's the formula. One thing you can do is use this \(\large \tan a = \frac{\sin a}{\cos a}\) \[\frac{1 - \frac{\sin^2a}{\cos^2a}}{1 + \frac{\sin^2a}{\cos^2a}}\]I hope you can do the algebra from here.

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

    ishaan do we expand the 1 into sin^2a +cos^2a?

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

    yeah! :-D

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

    can you expand this out cause i don't really get it

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

    okay, i will try. \[\large \frac{\frac{cos^2a - \sin^2a}{\cos^2a}}{\frac{\cos^2a+\sin^2a}{\cos^2a}}\] \[\Large \frac{\frac{cos^2a - \sin^2a}{\cancel\cos^2a}}{\frac{1}{\cancel \cos^2a}}\] \[\cos^2a - \sin^2a = \cos 2a\]

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

    oh i see thank you very much

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

    no problem

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

    hey ishaan don't we get 2cos2a then and not 2/cos2a

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

    no i think you forgot the real equation it's \(2 \frac{1 +tan^2a}{1 - tan^2a}\)

  12. 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.