Question:`x^2 - 2x + 1 = 0` হলে-- `i. x + 1/x = 2` `ii. x^2 + 1/x^2 = 4` `iii. sqrt x - 1/sqrt x = 0` নিচের কোনটি সঠিক? 

A i ও ii 

B i ও iii 

C ii ও iii 

D i, ii ও iii 

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