=====tan=====
Syntax:

<code>
    #include <cmath>
    double tan( double arg );
</code>
The tan() function returns the tangent of arg, where arg is given in radians.
If arg is infinite, tan() will return NAN and raise a floating-point exception.

C++ also provides the following overloaded forms:
<code>
    #include <cmath>
    float tan( float arg ); // same as tanf() in C99
    long double tan( long double arg ); // same as tanl() in C99
</code>

Related Topics: [[acos]], [[asin]], [[atan]], [[atan2]], [[cos]], [[cosh]], [[sin]], [[sinh]], [[tanh]]