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[" 57.If "f(x)=(1)/(sqrt(x+2sqrt(2x-4)))...

[" 57.If "f(x)=(1)/(sqrt(x+2sqrt(2x-4)))+(1)/(sqrt(x-2sqrt(2x-4)))" for "x>2],[" then "f(11)" is equal to "],[[" (a) "7/6," (b) "5/6],[" (c) "6/7," (d) "5/7]]

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