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Find the acute angle between the followi...

Find the acute angle between the following lines.
`2x=3y=-zand6x=-y=-4z`

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The lines are `(x)/(3)=(y)/(2)=(z)/(-6) and (x)/(2)=(y)/(-12) = (z)/(-3)`.
Since `a_(1)a_(2)+b_(1)b_(2)+c_(1)c_(2)=6-24+18=0`, we have
`" "theta=90^(@)`
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