sqrt(1 - x^6) + sqrt(1 - y^6) = a^3(x^3 - y^3): find dy/dx

1. A.
   $-\dfrac{x^2}{y^2}\sqrt{\dfrac{1 - y^6}{1 - x^6}}$
2. B.
   $\dfrac{y^2}{x^2}\sqrt{\dfrac{1 - y^6}{1 - x^6}}$
3. C.
   $\dfrac{x^2}{y^2}\sqrt{\dfrac{1 - y^6}{1 - x^6}}$
4. D.
   $-\dfrac{y^2}{x^2}\sqrt{\dfrac{1 - y^6}{1 - x^6}}$

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1. A.
   $\dfrac{x^2}{y^2}\sqrt{\dfrac{1 - x^6}{1 - y^6}}$
2. B.
   $\dfrac{y^2}{x^2}\sqrt{\dfrac{1 - y^6}{1 - x^6}}$
3. C.
   $\dfrac{x^2}{y^2}\sqrt{\dfrac{1 - y^6}{1 - x^6}}$
4. D.
   $0$

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