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Direction Cosine

Definition: The direction angles of a nonzero vector a are the angles alpha, beta, and gamma (in the interval [o, pi]) that a makes with the positive x, y, and z axes. The cosines of these direction angles, cos(alpha), cos(beta), and cos(gamma), are called the direction cosines of the vector a.
Source: Multivariable Calculus, 7th edition by James Stewart
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