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acos-Arc Cosine of Angle

Interface 

F_TYPE acos (F_TYPE x)

F_TYPE acosd (F_TYPE x)

Description

acos() computes the principal value of the arc cosine of x in the interval [0,pi] radians for x in the interval [-1,1].

acosd() computes the principal value of the arc cosine of x in the interval [0,180] degrees for x in the interval [-1,1].

Exceptions

Exceptional Argument       Routine Behavior

|x|>1                      Invalid argument