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Find the condition that one of the lines...

Find the condition that one of the lines given by `ax^2+2hxy+by^2=0` may coincide with one of the lines given by `a' x^2 +2h'xy+b'y^2=0`

Text Solution

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The correct Answer is:
`(ab'-a'b)^2=4(ah'-a'h)(h'b-hb')`
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