Machine Learning, Data Science, Linear Algebra, Matrix, Mathematics.
cosine of the angle made by the line/vector with x, y & z axes. e.g. direction cosines of the z-axis will be <cos(90), cos(90), cos(0)> = <0,0,1>. The z-axis is normal to xy-plane, so the equation of xy-pane will be — The angle between two vectors can be found using dot product between them. Let