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std::cos(std::complex)

性病：：COS%28 std：：Complex%29

Defined in header ​​
template< class T > complex<T> cos( const complex<T>& z ​​

计算复值的复余弦z...

参数

z-complex value

返回值

如果没有错误发生，则复余弦z会被归还。

处理错误和特殊情况时，就好像操作是由std::cosh(i*z)，在哪里i是想象中的单位。

注记

余弦是复平面上的一个完整函数，没有分支割集。余弦的数学定义是cos z=

伊兹+伊兹

*。

二

例

二次

#include <iostream>
#include <cmath>
#include <complex>
 
int main()
{
    std::cout << std::fixed;
    std::complex<double> z(1, 0 // behaves like real cosine along the real line
    std::cout << "cos" << z << " = " << std::cos(z)
              << " ( cos(1) = " << std::cos(1) << ")\n";
 
    std::complex<double> z2(0, 1 // behaves like real cosh along the imaginary line
    std::cout << "cos" << z2 << " = " << std::cos(z2)
              << " (cosh(1) = " << std::cosh(1) << ")\n";
}

二次

产出：

二次

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)

二次

另见

sin(std::complex)computes sine of a complex number (sin(z)) (function template)
tan(std::complex)computes tangent of a complex number (tan(z)) (function template)
acos(std::complex) (C++11)computes arc cosine of a complex number (arccos(z)) (function template)
coscomputes cosine (cos(x)) (function)
cos(std::valarray)applies the function std::cos to each element of valarray (function template)

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