Calculating minimum N so that error<10^-7 on matlab

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Daviddd
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Equation for a potential phi(x, y) as 32V0/pi^3 times the sum from n = 0 to infinity of (-1)^n/(2n+1)^3 times a bracket of two cosine-cosh terms over cosh terms, with arguments (2n+1)pi x/3, (2n+1)pi y/3, (2n+1)5pi/6, (2n+1)pi y/5, (2n+1)3pi/10.