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Showing content from https://cplusplus.com/reference/complex/cos/ below:

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)

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