$\begin{array}{l}{x}^2-1=0\\ \mathrm{>>>}[-1,1]\end{array}$

$\begin{array}{l}{x}^2-y^2=0\\ \mathrm{>>>}[-y,y]\end{array}$

$\begin{array}{l}\mathrm{solve}(x^2-1=0,x)\\ \mathrm{>>>}[-1,1]\end{array}$

$\begin{array}{l}\mathrm{solve}(x^2-y^2=0,x)\\ \mathrm{>>>}[-y,y]\end{array}$

$\begin{array}{l}\mathrm{solve}(\left\{\begin{array}{l}2y-x=1\\ 4y-x=3\end{array}\right.,x,y)\\ \mathrm{>>>}\{x:1,y:1\}\end{array}$

$\begin{array}{l}\frac{d^{2}f}{d{x}^2}+9f=0\\ \mathrm{>>>}f\left(x\right)=C_1*sin(3*x)+C_2*cos(3*x)\end{array}$

$\begin{array}{l}\mathrm{func}(f,x)\\ \mathrm{ode}(\frac{d^{2}f}{d{x}^2}+9f,f)\\ \mathrm{>>>}f\left(x\right)=C_1*sin(3*x)+C_2*cos(3*x)\end{array}$

$\begin{array}{l}1+2\frac{\partial f}{\partial x}/f+3\frac{\partial f}{\partial y}/f=0\\ \mathrm{>>>}f(x,y)=F(3*x-2*y)*e^{-\frac{2*x}{13}-\frac{3*y}{13}}\end{array}$

$\begin{array}{l}\mathrm{func}(f,x,y)\\ \mathrm{pde}(1+2\frac{\partial f}{\partial x}/f+3\frac{\partial f}{\partial y}/f)\\ \mathrm{>>>}f(x,y)=F(3*x-2*y)*e^{-\frac{2*x}{13}-\frac{3*y}{13}}\end{array}$