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Generic numeric operations | |||||||||||||||||||||||||||||||
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C-style checked integer arithmetic | |||||||||||||||||||||||||||||||
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Defined in header <complex> | ||
template<class T> complex<T> cos(const complex<T>& z); | ||
Computes complex cosine of a complex valuez.
Contents |
z | - | complex value |
If no errors occur, the complex cosine ofz is returned.
Errors and special cases are handled as if the operation is implemented bystd::cosh(i * z)
, wherei
is the imaginary unit.
The cosine is an entire function on the complex plane, and has no branch cuts.
Mathematical definition of the cosine iscos z =eiz +e-iz |
2 |
#include <cmath>#include <complex>#include <iostream> int main(){std::cout<<std::fixed;std::complex<double> z(1.0,0.0);// behaves like real cosine along the real linestd::cout<<"cos"<< z<<" = "<<std::cos(z)<<" ( cos(1) = "<<std::cos(1)<<")\n"; std::complex<double> z2(0.0,1.0);// behaves like real cosh along the imaginary linestd::cout<<"cos"<< z2<<" = "<<std::cos(z2)<<" (cosh(1) = "<<std::cosh(1)<<")\n";}
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)
computes sine of a complex number (\({\small\sin{z}}\)sin(z)) (function template)[edit] | |
computes tangent of a complex number (\({\small\tan{z}}\)tan(z)) (function template)[edit] | |
(C++11) | computes arc cosine of a complex number (\({\small\arccos{z}}\)arccos(z)) (function template)[edit] |
(C++11)(C++11) | computes cosine (\({\small\cos{x}}\)cos(x)) (function)[edit] |
applies the functionstd::cos to each element of valarray (function template)[edit] | |
C documentation forccos |