Definition:Direction Cosines/Also presented as
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Direction Cosines: Also presented as
Some sources do not dwell on the actual angles themselves, but instead denote the direction cosines directly as $\alpha$, $\beta$ and $\gamma$.
While this technique results in more streamlined notation, it can result in confusion.
Sources
- 1936: Richard Courant: Differential and Integral Calculus: Volume $\text { II }$ ... (previous) ... (next): Chapter $\text I$: Preliminary Remarks on Analytical Geometry and Vector Analysis: $1$. Rectangular Co-ordinates and Vectors: $2$. Directions and Vectors. Formulæ for Transforming Axes
- 1970: George Arfken: Mathematical Methods for Physicists (2nd ed.) ... (previous) ... (next): Chapter $1$ Vector Analysis $1.1$ Definitions, Elementary Approach: $(1.5)$