Answer to Question #15212 in Mechanics | Relativity for naeim vhora
perpendicular to each of given vectors and this 3 vectors have right
orientation, and length of third vector is equal product of lengths of
first two vectors and sine of angle between them.
Other words length of vector
cross-product is area of parallelogram built on given 2 vectors.
of parallelogram includes sine in its formula, then we take sine.
product we take projection& of the first vector on another one, and that is
why we used cosine.
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