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Function cot() calculates the cotangent value of a radian.
Arguments：
Returns：
Example: Calculate the cotangent value of degree 45°
return cot(45 * pi() / 180)
1
Example: Calculate the cotangent value of each row (radian) of an alias
uncollect [1, 2.5, 3] as a
return cot(a)
0.642092615934331
-1.33864812830415
-7.01525255143453
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