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If a=min {x^2+4x+5:x in R} and b=lim(the...

If `a=min {x^2+4x+5:x in R} and b=lim_(thetato 0) (1-cos 2theta)/(theta^2)`, then the value of `sum_(r=0)^(n) .^nC_ra^rb^(n-r)`, is

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