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Explanation:

Equation $\frac{{\mathrm{x}}^2}{{\mathrm{a}}^2}+\frac{{\mathrm{y}}^2}{{\mathrm{b}}^2}=1$ represents an ellipse.

Hence, the given curve is an ellipse. We need to figure out the foci of this ellipse.

Also, Cos√2 - cos√3 > Sin√2 - Sin√3 > 0

⇒ b² > a²

∴ Foci is on y-axis.

Hence, option (a).