Returns the tangent of the given number in radians.

**Sample Usage**

TAN(1)

TAN(C5)

**Syntax**

ATAN(number)

- number - The angle, in radians, for which the tangent is to be computed.

**Examples**

TAN(1) returns the tangent of 1 i.e. 1.55740

TAN(1) returns the tangent of the number contained in C5.