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COMEDK2012MathematicsDifferentiation

If x y + y x = a , then y d x d y =

Options

  1. Ax y
  2. By x
  3. Cx
  4. D0

Correct answer

C. x

Step-by-step solution

We have, array r x y + y x = a ( x y + y x )²=a x y + y x +2=a array Differentiating both sides w.r.t. x , y-x d y d x y² + x d y d x -y x² =0 y-x d y d x y² =- (x d y d x -y ) x² x y² d y d x -y³=-x² y+x³ d y d x d y d x (x y²-x³ )=-x² y+y³ d y d x = y (y²-x² ) x (y²-x² ) d y d x = y x Now, y d x d y =y x y =x

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