$\int \frac{dx}{x\sqrt{2ax - x^2}}$ का मान ज्ञात करने के लिए,उपयुक्त प्रतिस्थापन (substitution) है

  • A
    $x = a \cos t$
  • B
    $x = 2a \cos t$
  • C
    $x = 2at$
  • D
    $x = \frac{2a}{t}$

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