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If x^2+alphay^2+2betay=a^2 represents a ...

If `x^2+alphay^2+2betay=a^2` represents a pair of perpendicular straight lines , then

A

`alpha=1,beta=a`

B

`alpha=1,beta=-a`

C

`alpha=-1,beta=-a`

D

`alpha=-1,beta=a`

Text Solution

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The correct Answer is:
C, D
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