std::tan

From Cppreference

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Defined in header <cmath>
float       tan( float arg );
double      tan( double arg );
long double tan( long double arg );

Computes tangent of arg

[edit] Parameters

arg

-

floating point value representing angle in radians

[edit] Return value

tangent of arg.

Domain error occurs if arg is infinite. NAN is returned in that case.

[edit] See also

sin	computes sine (sin(x)) (function)
cos	computes cosine (cos(x)) (function)
atan	computes arc tangent (arctan(x)) (function)