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Returns the cosine of the angle in radians given by its argument.
COS( numeric-expression )
The angle, in radians.
This function converts its argument to DOUBLE, performs the computation in double-precision floating-point arithmetic, and
returns a DOUBLE as the result. If the parameter is NULL, the result is NULL.
The following statement returns the value of the cosine of an angle 0.52 radians.
SELECT COS( 0.52 );