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[" 93."((2^(n)+2^(n-1)))/((2^(n+1)-2^(n)...

[" 93."((2^(n)+2^(n-1)))/((2^(n+1)-2^(n)))(1)/(sin41+(1)/(6))],[[" (a) "(1)/(2)," (b) "(3)/(2)],[" (c) "2^((n-1)/(n+1))," (d) "(3)/(sqrt(14))#(1)/(n+1)]]

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