InterviewSolution
`(SQRT(X^(2) + x + 1) + isqrt(x^(2) - x + 1))/(SQRT2)``(sqrt(x^(2) + x + 1) - isqrt(x^(2) - x + 1))/(2)``sqrt( x+1) + isqrt(x -1)``sqrt(x - 1) +isqrt (x + 1)`
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