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if e and d are the eccentricities of a hyperbola and its conjugate hyperbola , then \frac{1}{e^{2}}+\frac{1}{d^{2}}=?
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if e and d are the eccentricities of a hyperbola and its conjugate hyperbola , then \frac{1}{e^{2}}+\frac{1}{d^{2}}=?