Standard C++ Library Reference ISO/IEC (VERSION3)

tan, tanf, tanl

double tan(double x);

float tan(float x); [C++ only]

long double tan(long double x); [C++ only]

float tanf(float x); [required with C99]

long double tanl(long double x); [required with C99]

The function returns the tangent of x. If x is large the value returned might not be meaningful,

but the function reports no error.

tanh, tanhf, tanhl

double tanh(double x);

float tanh(float x); [C++ only]

long double tanh(long double x); [C++ only]

float tanhf(float x); [required with C99]

long double tanhl(long double x); [required with C99]

The function returns the hyperbolic tangent of x.

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