Form a partial differential equation by eliminating the arbitrary functions from the equation z = f(x + ay) + ∅(x - ay).
1
\(\frac{\partial^{2} z}{\partial x \partial y}=a^{2} \frac{\partial^{2} z}{\partial x^{2}}\)
2
\(\frac{\partial^{2} z}{\partial y^{2}}=-a^{2} \frac{\partial^{2} z}{\partial x^{2}}\)
3
\(\frac{\partial^{2} z}{\partial y^{2}}=a^{2} \frac{\partial^{2} z}{\partial x \partial y}\)
4
\(\frac{\partial^{2} z}{\partial y^{2}}=a^{2} \frac{\partial^{2} z}{\partial x^{2}}\)
5
Not Attempted