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Let x1=sqrt2,x2=sqrt(2+sqrt2),x3=sqrt(2...

Let `x_1=sqrt2,x_2=sqrt(2+sqrt2),x_3=sqrt(2+sqrt(2+sqrt2))..........,x_n=sqrt(2+sqrt(2+sqrt2))+.........n` (times), Then `2sin(1+1/2+1/4+1/8++1/(2^(2005)))4 5^(@)` must be

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