How would you solve it: Part 4

Calculus Level 5

n = 0 ( 1 ) n n + 1 ( 2 n n ) 1 = α β ln η ϕ δ ( ln γ ϕ ) \large \displaystyle \sum_{n=0}^{\infty}\dfrac{(-1)^{n}}{n+1}{2n \choose n}^{-1} = \dfrac{\alpha}{\sqrt{\beta}}\ln^{\eta}{\phi} - \delta(\ln^{\gamma}{\phi}) If the above summation is true for positive integers: α , β , γ , δ , η \alpha,\beta,\gamma,\delta,\eta and that β \beta is a prime, then compute: α + β + γ + δ + η \alpha+\beta+\gamma+\delta+\eta .
Note that: ϕ \phi is the Golden ratio
This is 95 95 % Original


The answer is 20.

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1 solution

Adam Madni
Sep 7, 2020

The generating function of x^(n+1) / (n+1) Choose(2n,n) from 0 to infinity is 8 sqrt(x/4-x)*arcsin(sqrt(x)/2)-4arcsin^2(sqrt(x)/2) Then just plug in -1 for x and then divide by negative one. To prove this start out with the generating function for x^n/Choose(2n,n) by using the beta function then integrate. Sry idk how to use latex

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