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ngkamsengpeter
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Homework Statement
Given a vector R=Rx + Ry + Rz , prove that the cos a = Rz/R where a is the angle between vector Rz and R .
Homework Equations
I just don't know how to start .
A 3 dimensional vector is a mathematical representation of a quantity that has both magnitude and direction in 3-dimensional space. It is commonly denoted by three numbers (x, y, z) and can be used to represent physical quantities such as displacement, velocity, and force.
To add or subtract 3 dimensional vectors, you simply add or subtract the corresponding components of each vector. For example, to add two vectors (a, b, c) and (d, e, f), the resulting vector would be (a + d, b + e, c + f). Similarly, to subtract two vectors (a, b, c) and (d, e, f), the resulting vector would be (a - d, b - e, c - f).
The dot product of two 3 dimensional vectors is a scalar quantity that represents the projection of one vector onto the other. It is calculated by multiplying the corresponding components of each vector and adding them together. The resulting value is a measure of the similarity between the two vectors.
The cross product of two 3 dimensional vectors is another vector that is perpendicular to both of the original vectors. It is calculated by taking the determinant of a 3x3 matrix composed of the two vectors and the unit vectors in the x, y, and z directions. The resulting vector is orthogonal to the plane formed by the two original vectors.
3 dimensional vectors have a wide range of applications in fields such as physics, engineering, and computer graphics. They can be used to describe the motion of objects, the forces acting on them, and the shape and orientation of 3D objects. In computer graphics, they are often used to represent points, directions, and transformations in 3D space.