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Which of the following pairs(s) of curve...

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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