std::tan,std::tanf,std::tanl (3) - Linux Man Pages
Defined in header <cmath>
float tan ( float arg );
float tanf( float arg ); (since C++11)
double tan ( double arg ); (1) (2)
long double tan ( long double arg );
long double tanl( long double arg ); (3) (since C++11)
double tan ( IntegralType arg ); (4) (since C++11)
1-3) Computes the tangent of arg (measured in radians).
4) A set of overloads or a function template accepting an argument of any integral_type. Equivalent to 2) (the argument is cast to double).
arg - value representing angle in radians, of a floating-point or Integral_type
If no errors occur, the tangent of arg (tan(arg)) is returned.
The result may have little or no significance if the magnitude of arg is large (until C++11)
If a domain error occurs, an implementation-defined value is returned (NaN where supported)
If a range error occurs due to underflow, the correct result (after rounding) is returned.
Errors are reported as specified in math_errhandling.
If the implementation supports IEEE floating-point arithmetic (IEC 60559),
* if the argument is ±0, it is returned unmodified
* if the argument is ±∞, NaN is returned and FE_INVALID is raised
* if the argument is NaN, NaN is returned
The case where the argument is infinite is not specified to be a domain error in C (to which C++ defers), but it is defined as a domain_error_in_POSIX
The function has mathematical poles at π(1/2 + n); however no common floating-point representation is able to represent π/2 exactly, thus there is no value of the argument for which a pole error occurs.
// Run this code
sinl computes sine (sin(x))
cosl computes cosine (cos(x))
atanl computes arc tangent (arctan(x))
tan(std::complex) (function template)
tan(std::valarray) (function template)