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Show that the angle between the lines gi...

Show that the angle between the lines given by `(a+2hm+bm^2)x^2+2 {(b-a)m-(m^2-1)h} xy+(am^2-2hm+b)y^2=0` is the same whatever be the value of m ,.

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The correct Answer is:
Which is independent of m, Hence the angle between the lines representing by Eq. (i) is same for all values of m .
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