for all admissible values of 'a' the staright line 2ax + y[sq root of (1-a^2)] = 1 will touch an eliipse whose eccentricity is

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Sum of series 2[n/2] ! [n/2]!/ n! [2Co-2C2+3C2....+[-1]^n[n+1]2Cn] where n is an even positive integer. Kindly provide solution of this question and how to generalise this. How do we know that which expansion will give this?

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