Ex 10.2, 13 - Find direction cosines of A (1, 2, -3), B(-1, -2, 1) - Joining two points

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Ex 10.2, 13 Find the direction cosines of the vector joining the points A (1, 2, 3) and B( 1, 2,1), directed from A to B. A( 1, 2 , 3) B( 1, 2, 1) = ( 1 1) + ( 2 2) + (1 ( 3)) = 2 4 + 4 Directions ratios are a = 2, b = 4, & c = 4 Magnitude of = 2 2 + 4 2 +42 = 4+16+16 = 36 = 6 Directions cosines are , , = 2 6 , 4 6 , 4 6 = , ,

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