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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code/../../numeric/complex/cos.html below:

template< class T > complex<T> cos( const complex<T>& z );

Computes complex cosine of a complex value z.

[edit] Parameters [edit] Return value

If no errors occur, the complex cosine of z is returned.

Errors and special cases are handled as if the operation is implemented by std::cosh(i * z), where i is the imaginary unit.

[edit] Notes

The cosine is an entire function on the complex plane, and has no branch cuts.

Mathematical definition of the cosine is

cos z =

[edit] Example

Output:

cos(1.000000,0.000000) = (0.540302,-0.000000) ( cos(1) = 0.540302)
cos(0.000000,1.000000) = (1.543081,-0.000000) (cosh(1) = 1.543081)

[edit] See also

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