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

aussy123 Group Title

Write the following expression as a function of a positive acute angle. cos 125

  • one year ago
  • one year ago

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

    @aussy123 It might help you to know that with your angle in degrees, \[\large \cos \ \theta = \sin (90^o - \theta) \]

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

    So \[\large \cos(125^o)=\sin(90^o - 125^o)=\sin(-35^o)\]

    • one year ago
  3. aussy123 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    why did you use sin

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

    It's an identity. It didn't say to use a specific function, it just says use a function.

    • one year ago
  5. aussy123 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    oh sorry

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

    Get it now?

    • one year ago
  7. aussy123 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    yes a little

    • one year ago
  8. aussy123 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    the answer is -cos55

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

    I suppose so. You're right :) It stems from the fact that it's equal to sin(-35) = -sin(35) = -cos(90 - 35)

    • one year ago
  10. aussy123 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    I tried that way too, but I also did cos 125 = cos (180 - 125) = - cos 55

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

    Well, as long as your methods are valid, it should be no problem.

    • one year ago
  12. aussy123 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Thank you!

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

    No problem :)

    • 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.