| http://www.w3.org/ns/prov#value | - Input SEH Exception Matherr Exception ?? QNAN,IND none _DOMAIN Remarks The atan function calculates the arctangent of x. atan2 calculates the arctangent of y/x. atan2 is well defined for every point other than the origin, even if x equals 0 and y does not equal 0. atan has an implementation that uses Streaming SIMD Extensions 2 (SSE2).
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