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

sunnymony Group Title

how sin2a +cos2a =1

  • 2 years ago
  • 2 years ago

  • This Question is Closed
  1. hubertH Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    what is the question must u prove that the RHS=LHS?

    • 2 years ago
  2. sunnymony Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    prove that this question?

    • 2 years ago
  3. scarydoor Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    you mean sin^2 a + cos^2 a = 1.

    • 2 years ago
  4. scarydoor Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    What I do is remember how sin and cos can be thought of as coming out of the unit sphere, with certain angles, and forming a right angle triangle from the angle, etc. Then you just have pythagoras' theorem.

    • 2 years ago
  5. scarydoor Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    |dw:1353754710511:dw|

    • 2 years ago
  6. asnaseer Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    you can actually prove it on any right-angled triangle by drawing it as follows: |dw:1353754910236:dw|

    • 2 years ago
  7. asnaseer Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    then use definition of sin(theta) and cos(theta) and pythagorus to prove it

    • 2 years ago
  8. sunnymony Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    ok

    • 2 years 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.