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[" If "(x cos theta)/(a)+(y sin theta)/(...

[" If "(x cos theta)/(a)+(y sin theta)/(b)=1" and "(x sin theta)/(a)+(y cos theta)/(b)=],[" then "],[[" 1) "(x^(2))/(a^(2))+(y^(2))/(b^(2))=1," 2) "(x^(2))/(a^(2))-(y^(2))/(b^(2))=1],[" 3) "(x^(2))/(a^(2))+(y^(2))/(b^(2))=2," 4) "(x^(2))/(a^(2))-(y^(2))/(b^(2))=2]]

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