$2x^5+3x^4+2x^3+x$
$2x^3-2x^2-40x$
$\int\frac{2x-1}{\left(x^2-1\right)\left(x+1\right)}dx$
$\frac{1+\sin^2x}{\cos^2x}=\frac{\cos\left(x\right)}{1-\sin\left(x\right)}$
$-2x+7<23$
$-x^2-4-x^2+x$
$x+1<0$
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