$\int\frac{2x^2-1}{\left(x+1\right)\left(x-1\right)^2}dx$
$x^2-12x+16$
$\left(5\:-3y\right)^2$
$r^2+4r=-1$
$20x+-40x$
$\left(1+tagx\right)^2\:\cdot\:sec^2x$
$\frac{\tan\left(x\right)-\cot\left(x\right)}{1-2\cos^2\left(x\right)}$
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