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The equation 3ax^2+9xy+(a^2-2)y^2=0 repr...

The equation `3ax^2+9xy+(a^2-2)y^2=0` represents two perpendicular straight lines for

A

only one value of a

B

for all values of a

C

for only two values of a

D

for no value of a

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The correct Answer is:
C
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