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Angle between the lines whose direction ratios are a,b,c and $b - c, c - a, a - b$ is

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detailed solution

Correct option is D

a1a2+b1b2+c1c2=0a(b-c)+b(c-a)+c(a-b)=ab-ac +bc-ca+ca-ab=0

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Angle between the lines whose direction ratios are a,b,c and b-c,c-a,a-b is

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Angle between the lines whose direction ratios are a,b,c and $b - c, c - a, a - b$ is