Tangent Graph

The tangent function has a completely different shape, it goes between negative and positive infinity, crossing through 0. At pi/2 radians, or 90 degrees the function is officially undefined, because it could be positive infinity or negative infinity. For a tangent graph one cycle occurs between -pi/2 and pi/2. There are vertical asymptotes at each end of the cycle. The asymptote that occurs at pi/2 repeats every pi units. The period is pi and there is no amplitude because the graph continues on forever in vertical directions. 

Tangent graph: