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Show that if two of the lines ax^3+bx^2y...

Show that if two of the lines `ax^3+bx^2y+cxy^2+dy^3=0 (a ne 0)` make complementary angles with X -axis in anti -clockwise sense, then a(a-c)+d(b-d)=0 .

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The correct Answer is:
`therefore a(a-b)+d(b-d)=0`
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