If u - sin 3x cos 4y then- verify -2u- x- y - -2 u- y- x

∂ u∂ x = cos 4y ·cos 3x . 3 = 3cos 3x cos 4 ; ∂ u∂ y = sin 3x ( sin 4y) = 4sin 3x sin 4y ; ∂^2u∂ x∂ y = ∂∂ x (∂ u∂ y ) = ∂∂ u ( 4sin 3x sin 4y) ...

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Composite Function

If u = sin ...

Question

If $u = sin 3 x cos 4 y$ then, verify $\frac{\partial^{2} u}{\partial x \partial y} = \frac{\partial^{2} u}{\partial y \partial x}$

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