The TAN function is a Math and Trigonometry function, and its purpose is to return a tangent of a number or angle. In this post, we show you how to use the TAN function in Microsoft Excel.

The tangent can be determined with a collection of mathematical formulas but is most commonly determined by dividing the sine function by the cosine function.

These functions include SIN, COS, TAN, ASIN, ACOS, and ATAN. You must enter the function name in a cell to use these functions, followed by the argument (the angle or number you want to evaluate).