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''arcus function''

A function inverse to a trigonometric function, i.e. one of the functions: arcsine, arccosine, arctangent, arccotangent, arcsecant, arccosecant. Cf. [[Inverse trigonometric functions|Inverse trigonometric functions]].

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<table><TR><TD valign="top">[1]</TD> <TD valign="top">  J.A. Stegun,   "Handbook of mathematical functions" , ''Appl. Math. Ser.'' , '''55''' , Nat. Bur. Standards  (1964)  (Dover reprint, 1972)</TD></TR></table>