In order to remove xy term from the equation 5x2 + 4under root(3)xy + 9y2 -8 =0 the coordinate axis must be rotated through an angle?

Hii

Convert it into a quadratic equation in which the discriminant is a perfect square .

You will get tho equations of lines .Find the angle between them , smaller of the angle between them is the angle by which you must rotate you axis in order to get equations without x and y.


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