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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.
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.

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phi
 one year ago
Best ResponseYou've already chosen the best response.1Yes, 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 90a

phi
 one year ago
Best ResponseYou've already chosen the best response.1now form the triangle we are interested in dw:1436790048402:dw

phi
 one year ago
Best ResponseYou've already chosen the best response.1btw, here is a more clear proof by Khan https://www.khanacademy.org/math/differentialcalculus/limits_topic/squeeze_theorem/v/prooflimsinxx
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