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junior college 2 | H2 Maths
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hi! may i get help for this ~
a × b = - a × c
a × b + a × c = 0
a × (b + c) = 0
Since a × (b + c) = 0,
a is parallel to (b + c)
so a = k(b + c), k is a real constant.
By the way, if you want to elaborate further, you might want to add that the straight line passes through the point (0,0,2) and is parallel to the vector (1 0 -3)
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