In trigonometry, the inverse of a trigonometric function is the function that reverses the effect of the original function. The inverse of a trigonometric function is denoted by an ARC (ARC) and is usually represented by the inverse symbol (⁻¹). The inverse of a trigonometric function is also known as the 'ARC' or 'anti-trigonometric' function. Inverse trigonometric functions are used to solve equations involving trigonometric functions. They can also be used to find the angle of a triangle given the lengths of its sides.