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function template
<complex>

std::cos

template<class T> complex<T> cos (const complex<T>& x);
Cosine of complex
Returns the cosine of the complex number x.

This is the complex version of the cos function (defined in <cmath>).

Parameters

x
Complex value, representing an angle expressed in radians.

Return value

Cosine of x.

See also

sin
Sine of complex (function template )
tan
Tangent of complex (function template )
cosh
Hyperbolic cosine of complex (function template )
cos (cmath)
Compute cosine (function )

C++

Reference