inverse trigonometric function

The arcsine function is the inverse of the sine function restricted to ([-\pi/2,\pi/2]), with domain ([-1,1]) and range ([-\pi/2,\pi/2]).

The arccosine function is the inverse of the cosine function, assigning each value in the interval \([-1,1]\) its principal angle in \([0,\pi]\).

The arctangent function is the inverse of the tangent function, assigning each real number the angle whose tangent equals that number.