Answer :

AL2006

There are millions of them ... an infinite number of them, I think.
Here are a few of them:

9 x 1
(3)²
(-3)²
(4 + 5)
3 x 3
(8 + 1)
√81
(11 - 2)
(-√3)⁴
7 sin(90°) - 2 cos(180°)
(27 seconds) / (3 Hz)
(999 - 990)


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