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Mathematics 13 Online
OpenStudy (anonymous):

Please help: Jose and aparna were attempting to rotate the aces to eliminate the xy term for the equation x^2+2xy+3y^2-4x+5y-30. Jose used theta= -pi/8 and Aparna used theta =3pi/8. The students got different equations in x' and y', but both were correct. Explain how this is possible.

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