FUNCTION:  Tan( )

Tan(Number)
 
The Tan function returns the tangent for a number (angle).
 
Code:
<% =Tan(45.0) %>
 
Output:
1.61977519054386
 
You can also use a negative number (angle).
 
Code:
<% =Tan(-45.0) %>
 
Output:
-1.61977519054386