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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.