MCQ

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${{{d^2}x} \over {d{y^2}}}$= . . .

• A
  ${1 \over {{{(dy/dx)}^2}}}$
• B
  ${{\left( {{d^2}y/d{x^2}} \right)} \over {{{\left( {dy/dx} \right)}^2}}}$
• C
  ${{{d^2}y} \over {d{x^2}}}$
• ✓
  ${{\left( { - {d^2}y/d{x^2}} \right)} \over {{{\left( {dy/dx} \right)}^2}}}$