$\left(3tgx-5\:\right)^2$
$\lim_{x\to\infty}\left(\frac{3}{\pi}\right)^x$
$x^2-4x+5>0$
$\int2x^2\left(7-x^3\right)^5dx$
$20z^2+4z$
$\left(x^2\:-\:6x\:+\:3\right)\left(-x^2\:+\:3x\:-\:1\right)$
$x\left(x+1\right)=1$
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