Definition of direction cosine
: any of the cosines of the three angles between a directed line in space and the positive direction of the axes of a rectangular Cartesian coordinate system
—usually used in plural
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“Direction cosine.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/direction%20cosine. Accessed 17 May. 2022.
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Time Traveler for direction cosine
The first known use of direction cosine was circa 1889
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