Transform the equation by rotating the axes through the given angle. Identify the curve.2x2 - xy + 2y2 = 7; ? = 45°

A.  +  = 1; ellipse
B. x'2  - 3y'2 = 7; hyperbola
C.  +  = 1; ellipse
D.  +  = 1; ellipse

Answer: C

Mathematics

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