1.

If the pair of lines a x^(2)+2 h x y+b y^(2)=0 is rotated about the origin through 90^(0), then their equation in the new position is given by

Answer»

`AX^(2)-2hxy-by^(2)=0`
`ax^(2)-2hxy+by^(2)=0`
`BX^(2)+2hxy+ay^(2)=0`
`bx^(2)-2hxy+ax^(2)=0`

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