Inverse trigonometric functions

In mathematics, the inverse trigonometric functions (occasionally also called antitrigonometric,^[1] cyclometric,^[2] or arcus functions^[3]) are the inverse functions of the trigonometric functions, under suitably restricted domains. Specifically, they are the inverses of the sine, cosine, tangent, cotangent, secant, and cosecant functions,^[4] and are used to obtain an angle from any of the angle's trigonometric ratios. Inverse trigonometric functions are widely used in engineering, navigation, physics, and geometry.

^ Cite error: The named reference Hall_1909 was invoked but never defined (see the help page).
^ Cite error: The named reference cyclometric was invoked but never defined (see the help page).
^ Cite error: The named reference arcus was invoked but never defined (see the help page).
^ Weisstein, Eric W. "Inverse Trigonometric Functions". mathworld.wolfram.com. Retrieved 2020-08-29.