ArcCsc[z] gives the arc cosecant csc -1 (z) of the complex number z.

ArcSec[z] gives the arc secant sec -1 (z) of the complex number z.

ArcSinh[z] gives the inverse hyperbolic sine sinh -1 (z) of the complex number z.

ArcTan[z] gives the arc tangent tan -1 (z) of the complex number z. ArcTan[x, y] gives the arc tangent of y/x, taking into account which quadrant the point (x, y) is in.

ArithmeticGeometricMean[a, b] gives the arithmetic-geometric mean of a and b.

AspectRatio is an option for Graphics and related functions that specifies the ratio of height to width for a plot.

Assuming[assum, expr] evaluates expr with assum appended to $Assumptions, so that assum is included in the default assumptions used by functions such as Refine, Simplify, and ...

AtomQ[expr] yields True if expr is an expression which cannot be divided into subexpressions, and yields False otherwise.

Axes is an option for graphics functions that specifies whether axes should be drawn.

BaseForm[expr, n] prints with the numbers in expr given in base n.