CBSE Class 10 Answered
vectors
Asked by Rinkus | 02 Aug, 2008, 02:29: PM
Expert Answer
put l = -(m+n) in second equation.
you will get m2 + n2 +mn=0
this equation is quadratic in m so product of roots is m1m2 = - n2
similarly this equation is quadratic in n so product of roots is n1n2 = - m2
similarly replace m = -(l+n) we will get l2 + n2 +ln=0
so l1 l2 = - n2 and n1n2 = - l2
similarly replacing n = -(l+m)
we get l1 l2 = - m2 and m1m2 = - l2
now l1l2+m1m2+n1n2 = l2+m2+n2 = 0
i.e. angle between these lines are 90
Answered by | 10 Aug, 2008, 02:58: PM
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