. ' \( r \) ' त्रिज्या के सभी वृत्तों का अवकल समीकरण है- (A) \( \left\{1+\left(y_{1}\right)^{2}\...

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. ' \( r \) ' त्रिज्या के सभी वृत्तों का अवकल समीकरण है-
(A) \( \left\{1+\left(y_{1}\right)^{2}\right\}^{3}=r^{2}\left(y_{2}\right)^{2} \)
(B) \( \left(1+y_{1}\right)^{3}=r^{2} y_{2} \)
(C) \( \left(1+y_{2}\right)^{3}=r^{2}\left(y_{1}\right)^{2} \)
(D) इनमें से कोई नहीं।
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