Consider the equation ax2 + bxy + cy2 = d, where b 0. Introduce new variables x1

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Consider the equation ax2 + bxy + cy2 = d, where b ‰  0. Introduce new variables x1 and y1 by rotating the axes counterclockwise through an angle θ. Show that the resulting equation has no xy1-term if θ is given by
Consider the equation ax2 + bxy + cy2 = d,
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