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What (who) is direction cosine - definition
Direction cosine
COSINES OF THE ANGLES BETWEEN THE VECTOR AND THE THREE COORDINATE AXES.
Direction cosines; Directional cosine
In analytic geometry, the direction cosines (or directional cosines) of a vector are the cosines of the angles between the vector and the three positive coordinate axes. Equivalently, they are the contributions of each component of the basis to a unit vector in that direction.
COSINE
![Ottoman Turkey]] with axes for looking up the sine and [[versine]] of angles](https://commons.wikimedia.org/wiki/Special:FilePath/Khalili Collection Islamic Art sci 0040.1 CROP.jpg?width=200 "Ottoman Turkey]] with axes for looking up the sine and [[versine]] of angles")
![The quadrants of the unit circle and of sin(''x''), using the [[Cartesian coordinate system]]](https://commons.wikimedia.org/wiki/Special:FilePath/Sine quads 01 Pengo.svg?width=200 "The quadrants of the unit circle and of sin(''x''), using the [[Cartesian coordinate system]]")
TRIGONOMETRIC FUNCTIONS OF AN ANGLE
Cosine; Sine function; Sine squared; COSINE; SinX; Sine (trigonometric function); Cosine (trigonometric function); Sin x; Cosinus; Complex sine and cosine; Sin(x); Cos(x); Cosine function; Cosine of X; Sine of X; Sinx; Sinusoida; Sin(); Half chord; Complex sine; Sin z; Sin X; Vertical sine; Sinus rectus (mathematics); Sinus rectus (trigonometry); Sinus rectus (function); Sinus (trigonometry); Half-chord; Sinus rectus arcus; Sinus rectus primus; Sin (trigonometry); Cos (trigonometry); Sine (trigonometry); Sine (mathematics); Natural sine; Algorithms for calculating the sine function; S (trigonometry); Sin. (trigonometry); Draft:Sine and cosine; Sine; Sin and cos; Sinus and cosinus
Cooperation for Open Systems Interconnection Networking in
Europe. A EUREKA project.
cardinal point
![A [[compass rose]] showing the four cardinal directions, the four intercardinal directions, and eight more divisions.](https://commons.wikimedia.org/wiki/Special:FilePath/Brosen windrose.svg?width=200 "A [[compass rose]] showing the four cardinal directions, the four intercardinal directions, and eight more divisions.")
![Cardinal and non-compound intercardinal directions in Estonian and Finnish. Notice the intermixed "south" and "southwest". Further intermixing between directions south and northwest occur in other [[Finnic languages]].](https://commons.wikimedia.org/wiki/Special:FilePath/Ilmakaared+ilmansuunnat.svg?width=200 "Cardinal and non-compound intercardinal directions in Estonian and Finnish. Notice the intermixed \"south\" and \"southwest\". Further intermixing between directions south and northwest occur in other [[Finnic languages]].")
DIRECTIONS OF NORTH, EAST, SOUTH, AND WEST
Cardinal points; Intermediate direction; Cardinal Directions; Ordinal direction; Seven Directions; Seven directions; Ordinal directions; Intermediate directions; Cardinal directions; Northwest (direction); Southwest (direction); South (direction); North (direction); East (direction); Northeast (direction); Southeast (direction); West (direction); Cardinal point; Compass direction using a watch; Five Cardinal Points; Direction-finding watch; 5 cardinal point; Five cardinal point; North, South, East, and West; NSEW; Compass Direction Using Watch; Compass direction; Southeast (ordinal direction); Direction finding watch; Geographic direction; Direction Finding Watch; Intercardinal direction; Four Directions; Four directions; 4 Point Direction
¦ noun each of the four main points of the compass (north, south, east, and west).
