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myininaya
 5 years ago
is there a way to prove that cos(pi/3)=1/2
myininaya
 5 years ago
is there a way to prove that cos(pi/3)=1/2

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Let V be the image point corresponding with the angle pi/3 on the unit circle and let E the intersection point of that circle with the positive Xaxis. The triangle 'OVE' is equilateral. sin^2 (pi/3) = sqrt( 1  cos^2 (pi/3)) = sqrt(3)/2 So, sin(pi/3) = sqrt(3)/2 and cos(pi/3) = 1/2.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0if you write the cosine in terms of Euler's formula and expands in power series of the \[e^{i \theta} \] and \[e^{i \theta} \] , you will get cos( pi/3)=1/2.

myininaya
 5 years ago
Best ResponseYou've already chosen the best response.0these are cool things to know. I will be your fan :)

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0dw:1336890915598:dw \[\cos (\frac{\pi}{3}) = \frac{1}{2}\] hehe :P

myininaya
 4 years ago
Best ResponseYou've already chosen the best response.0Yes I know that one Wow this was a long time ago

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0lol i was supposed to look at your first question then i noticed this..thanks :D

myininaya
 4 years ago
Best ResponseYou've already chosen the best response.0i can't remember that i asked this
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