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JEEMAIN and NEET
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JEEMAIN PAST PAPERS
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1999
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Q)
If the axes are rotated through an angle $30^{\circ}$ about the origin, then the tranformed equation of $x^2 + 2 \sqrt{3} xy - y^2 = 2a^2$, is :
( A ) $x^2 - y^2 = 2a^2$
( B ) $x^2 - y^2 = a^2$
( C ) $x^2 + y^2 = a^2$
( D ) $x^2 + y^2 = 2a^2$
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