Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

kaylala

  • 11 months ago

Find the value of the following using the concepts of both addition and subtraction formulas and reference angle: sin 255

  • This Question is Closed
  1. kaylala
    • 11 months ago
    Best Response
    You've already chosen the best response.
    Medals 0

    @eliassaab

  2. kaylala
    • 11 months ago
    Best Response
    You've already chosen the best response.
    Medals 0

    @ganeshie8

  3. kaylala
    • 11 months ago
    Best Response
    You've already chosen the best response.
    Medals 0

    @Callisto

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

    \[ \sin (225)=-\sin (360-255)=-\sin (105)=-\sin (45+60)=\\-\sin (45)) \cos (60)-\sin (60) \cos (45) \]

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

    \[ -\sin (45)) \cos (60)-\sin (60) \cos (45)=-\frac{1+\sqrt{3}}{2 \sqrt{2}} \]

  6. kaylala
    • 11 months ago
    Best Response
    You've already chosen the best response.
    Medals 0

    why is it -sin(360-255) why the - sign there?

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

    \[ -\sin(360-255)=- \sin (-255) =-(-\sin( 255)) = \sin(255) \]

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

    Did you understand it?

  9. kaylala
    • 11 months ago
    Best Response
    You've already chosen the best response.
    Medals 0

    no sorry where did you get that?

  10. eliassaab
    • 11 months ago
    Best Response
    You've already chosen the best response.
    Medals 1

    If you add 360 to an angle you do not change the sine of that angle sin(360+y) = sin(y) sin( 360 +(-x)) =sin(-x) = -sin(x) If you do not know these elementary facts, please review them in your book or notes.

  11. eliassaab
    • 11 months ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Have you heard about periodic functions?

  12. kaylala
    • 11 months ago
    Best Response
    You've already chosen the best response.
    Medals 0

    have no heard of periodic functions ever @eliassaab

  13. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Ask a Question
Find more explanations on OpenStudy

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.