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(Solved): please do 1 Classify the given partial differential equation as hyperbolic, parabolic, ellipt ...
please do 1
Classify the given partial differential equation as hyperbolic, parabolic, elliptic: 1. \( \frac{\partial^{2} u}{\partial x^{2}}=\frac{\partial^{2} u}{\partial x \partial y}+\frac{\partial^{2} u}{\partial y^{2}}=0 \) 3. \( \frac{\partial^{2} u}{\partial x^{2}}=9 \frac{\partial^{2} u}{\partial x \partial y} \) 2. \( 3 \frac{\partial^{2} u}{\partial x^{2}}+5 \frac{\partial^{2} u}{\partial x \partial y}+\frac{\partial^{2} u}{\partial y^{2}}=0 \) 4. \( \frac{\partial^{2} u}{\partial x \partial y}-\frac{\partial^{2} u}{\partial y^{2}}+2 \frac{\partial^{2} u}{\partial x^{2}}=0 \)
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1) ?2u?x2??2u?x?y??2u?y2=0 A=1 B=-1 C
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