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By rotating the coordinates axes through `30^(@)` in anticlockwise sense the eqution `x^(2)+2sqrt(3)xy-y^(2)=2a^(2)` change to
A. `X^(2)-Y^(2)=3a^(2)`
B. `X^(2)-Y^(2)=a^(2)`
C. `X^(2)-Y^(2)=2a^(2)`
D. none of these

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