Solution of $\frac{xdx - ydy}{xdy - ydx} = \sqrt{\frac{1 - y^{2} + x^{2}}{x^{2} - y^{2}}}$
61105
solve$\frac{xdx+ydy}{xdy-ydx}=\sqrt{\frac{a^2-x^2-y^2}{x^2+y^2}}$
72023
Integer solutions of the equation $x^2+y^2+z^2 = 2xyz$
38894
Solve $x=y\frac{dy}{dx}-\left(\frac{dy}{dx}\right)^{2}$
135202
How to find the integration factor and solve $(x^3+xy^2-y) dx$ $+$ $(y^3+x^2y+x) dy$ $=$ $0$?
9143
Solve $u_{xx}-3u_{xt}-4u_{tt}=0$ where $u(x,0)=x^2$ and $u_t(x,0)=e^x$
13120
Find all integer solutions to $x^2+y^2+z^2=2xyz$
19074
Solution to matrix equation PX=YP
152293
Solution of $y''+xy=0$
114861
equation $\frac{\frac{1}{x^2}-\frac{1}{y^2}}{\frac{1}{x^2}+\frac{1}{y^2}}$
43385
Why is $\frac{\operatorname dy'}{\operatorname dy}$ zero, since $y'$ depends on $y$?
39995
Showing that partial derivatives of $f(x) = \frac{xy}{x^2+y^2}$ exist for $(x,y) \neq (0,0)$
68990
Show that $\frac 1{1+x+y^{-1}}+\frac1{1+y+z^{-1}}+\frac1{1+z+x^{-1}}=1$ if $xyz=1$
141795
Solve the second order ODE $(2x^2 + 1)y'' − 4xy' + 4y = 0$
57811
Properties of the solution of the Ordinary Differential Equation $y' = y(y-1)(y-2)$ as per the Initial conditions?
27127
Calculating $\iint (x+y) \, dx \, dy$
9211
$\int\frac{dx}{x-3y}$ when $y(x-y)^2=x$?
67158
Solve $y'-\int_0^xy(t)dt=2$