tan

Returns the tangent of an angle expressed in radians stored in angle.

An error occurs if angledoes not contain a valid angle. For example, p/2, 3p/2, or 5p/2.

Syntax

   tan(angle)

Table 1. tan parameters
Parameter	Type	Description
angle	Decimal number	Any decimal number representing the angle in radians.

Returns

A string containing the tangent, or an empty string if an error occurs.

Example

In this example, the result of tan is "-2.185040".

   <field sid="tanField">
      <label>Test tan()</label>
      <format>
         <datatype>string</datatype>
         <constraints>
            <mandatory>on</mandatory>
         </constraints>
      </format>
      <value compute="tan('2')"></value>
   </field>