A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • one year ago

I'm having trouble visualizing why in the geometric proof of the derivative of sine the two angles are congruent. Professor Jerison does something about rotating by 90 degrees the triangle but i quite don't understand why. This proof is given in lecture 3.

  • This Question is Closed
  1. phi
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Yes, I find that "explanation" unsatisfying we could make this argument:|dw:1436789799775:dw| where I used "a" rather than theta. and not a (a with bar) to represent 90-a

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

    now form the triangle we are interested in |dw:1436790048402:dw|

  3. phi
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    btw, here is a more clear proof by Khan https://www.khanacademy.org/math/differential-calculus/limits_topic/squeeze_theorem/v/proof-lim-sin-x-x

  4. 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.