[" 14.If "a(n+1)=sqrt((1)/(2)(1+a(n)))" ...

[" 14.If "a_(n+1)=sqrt((1)/(2)(1+a_(n)))" ,then "cos((sqrt(1-a_(0)^(2)))/(a_(n)a_(2)a_(1)-to oo))" is equal to "],[[" (A) "1," (B) "-1],[" (C) "a_(0)," (D) "1/a_(0)]]

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