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\begin{array} { l } { \text { If the equations } a x ^ { 2 } + 2 h x y + b y ^ { 2 } = 0 \text { and } b x ^ { 2 } - 2 h x y + a y ^ { 2 } = 0 } \\ { \text { represent the same curve, then, show that } a + b = 0 \text { . } } \end{array} |
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