For any integer value of x ≥ 0, there are two values, ±y, such that x! = y2.
For example, if x = 3 then x! = 6 and so y = ±√6
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x = 90 y = 89
-4
(x, y) = (-3, -3) or (3, 3)
j=-3 and k=2
Since the word 'equals' appears in your questions it might be what is called a trigonometric identity, in other words a statement about a relationship between various trigonometric values.