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Black Book Advanced Problems in MathematicsMathematicsFunctions

Which among the following relations is a function ? (where a, b, r are constants)

Options

  1. Ax^2 + y^2 = r^2
  2. Bx^2 a^2 + y^2 b^2 = r^2
  3. Cy^2 = 4ax
  4. Dx^2 = 4ay

Correct answer

D. x^2 = 4ay

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