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x y তলে অবস্থিত উপবৃত্তের সমীকরণ-

y^{2} - 4 x y = 0

x^{2} + y^{2} - a^{2} = 0

\frac{x^{2}}{a^{2}} + \frac{y^{2}}{b^{2}} - 1 = 0

\frac{x}{a} + \frac{y}{b} - 1 = 0

ANS : 2

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