Q.

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

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a

300

b

600

c

450

d

900

answer is D.

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Detailed Solution

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