Question #9c430

1 Answer
David Chi
Jul 27, 2017

a_n = pi(2n - 1)

Explanation:

To find x-intercepts, f(x) = 0.

cos(1/2x) = 0

x = 2cos^-1(0) = pi, 3pi, 5pi,...

a_n = pi(1 + 2(n - 1))

a_n = pi(2n -1)

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