InterviewSolution
`1+(2X^2)/(2!)+(2^3x^4)/(4!)+(2^5x^6)/(6!)+....OO` `1+(2x^2)/(2!)+(2^2x^4)/(4!)+(2^3x^6)/(6!)+....oo` `1+(x^2)/(1!)+(2x^2)/(2!)+(3x^3)/(3!)+....oo` `e^(2x) +e^(-2x)`
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