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atan-Arc Tangent of Angle with One Argument

Interface 

F_TYPE atan (F_TYPE x)

F_TYPE atand (F_TYPE x)

Description

atan() computes the principal value of the arc tangent of x in the interval [-pi/2,pi/2] radians for x in the interval [-infinity, +infinity].

atand() computes the principal value of the arc tangent of x in the interval [-90,90] degrees for x in the interval [-infinity, +infinity].

Exceptions

None.