#includeIn this example, two 3D vectors v1 and v2 are initialized using the Vector3d class constructor. The dot() function is then called on the v1 vector to calculate the dot product with v2. The result is stored in the dotProduct variable and printed to the console. The package library used in this example is Eigen, which provides various linear algebra operations for C++.#include int main() { Eigen::Vector3d v1(1.0, 2.0, 3.0); Eigen::Vector3d v2(4.0, 5.0, 6.0); double dotProduct = v1.dot(v2); std::cout << "Dot product of v1 and v2: " << dotProduct << std::endl; return 0; }