(c) $\because\ x = \frac{2at}{1 + t^{3}}\ \ and\ \ y = \frac{2{at}^{2}}{\left( 1 + t^{3} \right)^{2}}$ $\therefore 2ay = x^{2}$ $\Rightarrow \frac{dy}{dx} = \frac{x}{a}$
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Ph.D. in Physics with 19+ years of teaching experience.