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If `S=Sigma_(n=0)^(oo) (logx)^(2n)/(2n!)` , then S equals

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If `S=Sigma_(n=0)^(oo) (logx)^(2n)/(2n!)` , then S equals
A. `x+x^(-1)`
B. `x-x^(-1)`
C. `1/2(x+x^(1))`
D. none of these
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Correct Answer - c
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