find the direction cosines of the vector joining the point A( 1, 2,-3) and B (-1,-2,1) directed from a to b
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Answer:'6'
Step-by-step explanation:
Al 1, 2, -3)
B(-1, -2, 1)
AB = (-1-1) i + (-2-2) + (1-(-3)) k
=-21- 4ị + 4k
Directions ratios are
a=-2, b=-4, & c = 4
AB = V4+ 16 + 16
Magnitude of AB = (-2)2 + (-4)2 + 42
= V36 = 6
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