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Which of the following pair(s) of curves...

Which of the following pair(s) of curves is/are orthogonal?

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Which of the following pairs(s) of curves is/are orthogonal? (a) y^2 = 4 a x ; y = e^ (-x/ (2 a)) (b) y^2 = 4 a x ; x^2 = 4ay (c) xy = a^2 ; x^2-y^2 = b^2 (d) y = a x ; x^2 + y^2 = c^2

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