Good.
Testing math:
Theorem (Function rotation). Let $f$ be the function you want to rotate and $\theta$ be the angle counterclockwise from the $x$-axis you want to rotate it. Then the new function becomes $$y\cos \theta-x\sin \theta=f\left(x\cos \theta+y\cos \theta\right).$$
Look at this example:
Example. This is an example.
A definition:
Definition (Cube). A cube is a six-faced 3D object.