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OpenStudy (anonymous):
Which of the following standard forms might represent conic section x2 -3x + 4xy +y2 + 21y - 15 = 0 • A. x2/a2 + y2/b2 = 1 • B. x2+y2=R2 • C. y2=4ax • D. x2/a2 - y2/b2 = 1 • E. x2/a2-y2/b2=0
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