Definition:Tangent Function

Also see

 * Equivalence of Definitions of Tangent of Angle


 * Shape of Tangent Function
 * Tangent is Sine divided by Cosine


 * Definition:Sine
 * Definition:Cosine
 * Definition:Cotangent
 * Definition:Secant Function
 * Definition:Cosecant


 * Definition:Hyperbolic Tangent