X is equals to 1 + 2 power 1 by 2 and Y is equals to 1 - 2 power 1 by 2 then X square + Y square is
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So the square root of 4 is equal to ±2 (the notation "±" means "plus or minus"). Thus ... Sqrt(22) = (22)½ = 22 × ½ = 21 = 2 ... The square root is then written as a power of one
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