Express $w = \frac{\partial^2 u}{\partial x^2} + \frac{\partial^2 u}{\partial y^2}$ in polar coordinates
90684
confusion about the laplacian in polar coordinates
109699
How to factor$ x^2+2xy+y^2 $
114861
equation $\frac{\frac{1}{x^2}-\frac{1}{y^2}}{\frac{1}{x^2}+\frac{1}{y^2}}$
40184
Notation in partial differentiation
55713
Dirac delta in polar coordinates
16443
Laplacian in polar coordinates
120841
Solving the Helmholtz equation in polar coordinates
12254
How to write in polar form
16644
Why does cancellation of dots $\frac{\partial \dot{\mathbf{r}}_i}{\partial \dot{q}_j} = \frac{\partial \mathbf{r}_i}{\partial q_j}$ work?
103230
Find the general solution of $4u_{xx}+5u_{xy}+u_{yy}+u_x+u_y=2$
98653
Easiest way to solve $y''+y=\frac{1}{\cos x}$
108808
$x =r\cos \theta$ and $y = r\sin\theta$, determine $\frac{\partial r}{\partial x}$ and $\frac{\partial \theta}{\partial x}$
11205
Computing second partial derivative with polar coordinates
120895
Converting complex number raised to a power to polar form
65230
Expressing points in fractional dimensions?
25730
Solve $u_x + u_y + u = e^{x+2y}$
2205
Solving $x^{x^x}=c$ with Lambert's W function