If f(x) =(1+|sinx|) ^(a÷|sinx|), -π÷6=b, x=0=e^(tan2x÷tan3x), 0Find a and b so that the function is continuous at x=0

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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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