4.5 The Tangent Function and the Inverse Tangent Function

. The Tangent Function and the Inverse Tangent Function We know that the tangent function y = tan is used to find heights or distances, such as the height of a building, mountain, or flagpole. The domain of y = tan = sin x does not include values of x , which make the denominator zero. So, the tangent function is not defined at x =   . Thus, the domain of the tangent function = tan is x x : ∈ ≠ ∈   =  =−∞ ∞ and the range is −∞∞ .The tangent function y = tan has period p .