If \[x=a{{\cos }^{3}}\theta ,y=b{{\sin }^{3}}\theta ,\]then

1.	If \[x=a{{\cos }^{3}}\theta ,y=b{{\sin }^{3}}\theta ,\]then
A.	\[{{\left( \frac{a}{x} \right)}^{2/3}}+{{\left( \frac{b}{y} \right)}^{2/3}}=1\]
B.	\[{{\left( \frac{b}{x} \right)}^{2/3}}+{{\left( \frac{a}{y} \right)}^{2/3}}=1\]
C.	\[{{\left( \frac{x}{a} \right)}^{2/3}}+{{\left( \frac{y}{b} \right)}^{2/3}}=1\]
D.	\[{{\left( \frac{x}{b} \right)}^{2/3}}+{{\left( \frac{y}{a} \right)}^{2/3}}=1\]
Answer» D. \[{{\left( \frac{x}{b} \right)}^{2/3}}+{{\left( \frac{y}{a} \right)}^{2/3}}=1\]

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If \[x=a{{\cos }^{3}}\theta ,y=b{{\sin }^{3}}\theta ,\]then

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