Vectors
Addition of vectors; scalar multiplication; dot and cross products; scalar and vector triple products; geometrical interpretations.
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Let vector a = 2î + ĵ - k̂ and vector b = î - 2ĵ + k̂. If vector c is a unit vector perpendicular to both a and b, and makes an acute angle with the vector î + ĵ + k̂, then c equals