There is an isosceles prism of angle A ,for this prism the emergent ray at the second surface will be tangential to the surface when angle of incidence at the first surface is (in terms of A and trigonometric functions)

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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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