The inverse trigonometric functions are the inverse functions of the trigonometric functions, written cos^(-1) z, cot^(-1) z, csc^(-1) z, sec^(-1) z, sin^(-1) z, and tan^(-1) z. Alternate notations are sometimes used, as summarized in the following table. f(z) | alternate notations cos^(-1) z | arccos z cot^(-1) z | arccot z, arcctg z csc^(-1) z | arccsc z, arccosec z sec^(-1) z | arcsec z sin^(-1) z | arcsin z tan^(-1) z | arctan z, arctg z
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