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x=(e^n-e^(-n))/(e^n+e^(-n)) then the val...

`x=(e^n-e^(-n))/(e^n+e^(-n))` then the value of n

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A series of concentric ellipses E_1,E_2, E_3..., E_n are drawn such that E touches the extremities of the major axis of E_(n-1) , and the foci of E_n coincide with the extremities of minor axis of E_(n-1) If the eccentricity of the ellipses is independent of n, then the value of the eccentricity, is

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E_n = - (313.6)/(n^2) , If the value of E_i = -34.84 to which value ‘n’ corresponds

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If I_(n)=int_(1)^(e)(ln x)^(n)dx(n is a natural number) then I_(2020)+nI_(m)=e, where n,m in N .The value of m+n is equal to