1.

Let a=min {x^(2)+2, x in R} and b lim_( theta+ theta)(1-cos theta)/(theta^(2)), the value of overset(n) underset(r=0) sum a^(r), b^(n-r) is lim_( n to oo)n^(2){sqrt((1-"cos"^(1)/(n))sqrt((1-"cos"(1)/(n))sqrt((1-"cos"(1)/(n)).... alpha )))}

Answer»

`(2^(n+1)+1)/(3.2^(n))`
`(2^(n+1)-1)/(3.2^(n))`
`(4^(n+1)-1)/(3.2^(n))`
`(4^(n+1)+1)/(3.2^(n))`

Answer :C


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