$x-2\cdot x^2+x-1$
$\left(x^{a+2}+y^{a+1}\right)^2$
$\int\left(x^2\left(4-2x^3\right)^5\right)dx$
$\frac{x^3}{\left(x-4\right)^2}$
$\int\frac{q+1}{q^{2\:}-4q+3}dx$
$\left(-15+5\right)-\left(-17+5\right)$
$-\sec^{4}x+\tan^{4}x=-1-2\tan^{2}x$
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