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Prove that the equation (a+2h+b)x^2-2(a...

Prove that the equation `(a+2h+b)x^2-2(a-b)xy+(a-2h+b)y^2=0` represents a pair of lines each inclined at an angle of `45^@` to one or other of the lines given by , `ax^2+2hxy+by^2=0`

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`therefore (a+2h+b)x^2-2(a-b)xy+(a-2h+b)y^2=0`
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