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Returns the arc-tangent, in radians, of a number. Not supported by UltraLite Java edition databases.
ATAN( numeric-expression )
The tangent of the angle.
The ATAN and TAN functions are inverse operations.
This function converts its argument to DOUBLE, and performs the computation in double-precision floating-point arithmetic.
The following statement returns the arc-tangent value for 0.52.
SELECT ATAN( 0.52 );