The General Tangent Function

The tangent function is the reciprocal of the cotangent function. One of the distinct features of the tangent is the asymptotes which you can switch off with the check box.
The red dashed line is the base tangent function. One period is always highlighted. The blue line is the tangent in general form. This applet can be used by teachers in a demonstration mode in the classroom or teachers can have students load it on their own computers with a worksheet to be complete for a grade.