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The transformed equation of $3x^2+3y^2,2xy=2$ when the coordinate axes are rotated through an angle of $45^{\circ}$ is

\[\begin {array} {1 1} (1)\;x^2+2y^2=1 & \quad (2)\;2x^2+y^2=1 \\ (3)\;x^2+y^2=1 & \quad (4)\;x^2+3y^2=1 \end {array}\]
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answered Nov 7, 2013 by pady_1

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