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

itsonlycdeee

Prove the identity. sec θ − cos(−θ) = sin^2θ/cosθ I'm trying to transform the left side to the right side & so far I got: 1/ cosθ - cos(-θ) = 1/cosθ - cosθ =

  • 9 months ago
  • 9 months ago

  • This Question is Closed
  1. cwrw238
    Best Response
    You've already chosen the best response.
    Medals 1

    sin^2θ/cosθ = (1 - cos^2θ)/cosθ = 1 / cosθ - cos θ = secθ - cos θ

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

    if you want to continue from where you have left, try to make a common denominator \(\dfrac{1}{\cos \theta}- \cos \theta \times \dfrac{\cos \theta}{\cos \theta}=\dfrac{1-\cos^2 \theta}{\cos \theta}\) and lastly the use of \(\sin^2 x+\cos^2 x=1\) will lead you to right side :)

    • 9 months ago
  3. itsonlycdeee
    Best Response
    You've already chosen the best response.
    Medals 1

    @hartnm okay, that's what I'm attempting right now.

    • 9 months ago
  4. hartnn
    Best Response
    You've already chosen the best response.
    Medals 1

    good, did you get what i did ? if yes, can you continue ?

    • 9 months ago
  5. itsonlycdeee
    Best Response
    You've already chosen the best response.
    Medals 1

    Yes, it becomes sin^2θ/ cosθ. Thank you so much!

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

    you're most welcome ^_^

    • 9 months ago
  7. cwrw238
    Best Response
    You've already chosen the best response.
    Medals 1

    with these problems its often easier to start with the more complicated side as i did here

    • 9 months ago
  8. itsonlycdeee
    Best Response
    You've already chosen the best response.
    Medals 1

    @cwrw238 yeah, it'd take a few steps longer to go from the simpler side to the difficult one.

    • 9 months 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.