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**arcTan**Return the arc-tangent of the receiver.

**arcTan: aNumber**Return the arc-tangent of aNumber divided by the receiver.

**arg**Return the argument of the receiver.

**cos**Return the cosine of the receiver.

**cosh**Return the hyperbolic cosine of the receiver.

**exp**Return e raised to the receiver.

**ln**Return the natural logarithm of the receiver.

**log**Return the base-10 logarithm of the receiver.

**sin**Return the sine of the receiver.

**sinh**Return the hyperbolic sine of the receiver.

**sqrt**Return the square root of the receiver. Can be improved!

**tan**Return the tangent of the receiver.

**tanh**Return the hyperbolic tangent of the receiver.