User:Salix alba

I'm w:Salix alba on wikipedia.

A rotation matrix in block style <math display="block"> ... $$\left(\begin{array}{cc}\cos \theta & -\sin \theta \\ \sin \theta & 2\cos \theta \end{array}\right)$$ is the rotation matrix a reflection is in : style :<math>...

$\left(\begin{array}{cc}\cos 2\theta & \sin 2\theta \\ -\sin 2\theta & \cos 2\theta \end{array}\right)$

which is nice.

A display eqn $$\left(\begin{array}{cc}a& b\\ c& d\end{array}\right)$$

with no preceeding newline $$\int x\mathbf{d}x$$foo now add a new line

$$\int y\mathbf{d}y$$ A pythagoren triple, inline $a^2+b^2=c^2$.