nthRoot
nthRoot(a)
nthRoot(a, root)
Calculate the nth root of a value. The principal nth root of a positive real number A, is the positive real solution of the equation "x^root = A".
Try it yourself:
| $1 | 4 ^ 3
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| $2 | nthRoot(64, 3)
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| $3 | nthRoot(9, 2)
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| $4 | sqrt(9)
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