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For $$- \infty < x < \infty \& -1 < y < 1$$, the partial differential equation $$ x^{2} \frac{\partial^{2} u}{\partial x^{2}} + (1 - y^{2}) \frac{\partial^{2} u}{\partial y^{2}} = 0$$ is
parabolic
Hyperbolic
Elliptic
Nature connote be predicted
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