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JEE Math Practice Question

$${{{d^2}x} \over {d{y^2}}}$$ equals:

  1. A.$$ - {\left( {{{{d^2}y} \over {d{x^2}}}} \right)^{ - 1}}{\left( {{{dy} \over {dx}}} \right)^{ - 3}}$$
  2. B.$${\left( {{{{d^2}y} \over {d{x^2}}}} \right)^{}}{\left( {{{dy} \over {dx}}} \right)^{ - 2}}$$
  3. C.$$ - \left( {{{{d^2}y} \over {d{x^2}}}} \right){\left( {{{dy} \over {dx}}} \right)^{ - 3}}$$
  4. D.$${\left( {{{{d^2}y} \over {d{x^2}}}} \right)^{ - 1}}$$

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