Posted by JESSICA on Monday, October 15, 2007 at 9:31pm.
I got this problem but its unrelated to any material that we worked on. Can some please help me to solve it and please explain it. Thanks
Problem states:
Given:
x+(1/x)= square root of 3
PROVE:
(x^13)+(1/(x^13))= square root of 3

CALCULUS  Count Iblis, Monday, October 15, 2007 at 9:53pm
Put x = exp(i t)
Then:
x + 1/x = 2 cos(t)
x + 1/x = sqrt(3) >
cos(t) = sqrt(3)/2 >
t = ±pi/6 (adding a multiple of 2 pi leaves x invariant)
x^(13) + x^(13) = 2 cos(13 t) =
2 cos(13/6 pi) = 2 cos(pi/6) = sqrt(3)

CALCULUS  bobpursley, Monday, October 15, 2007 at 10:00pm
solve for x in the given equation using the quadratic equation. Then, describe it on the complex plane, a vector at 60deg.
But x^13 is the same value, rotated around the plane twice. 13*60=60 +n360
QED
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