$5+3\cdot2^3$
$-\:20\:+\:1\:+\:15\:+\:\:-\:50\:+\:9\:$
$\left(5r-\frac{1}{2}k\right)^2$
$7x^2-7x+5$
$4x^2-\left(2x+1\right)^2+4\left(x+1\right)^2+\left(2x+3\right)^2$
$\lim_{x\to7}\left(\frac{x-7}{x^2+5x-14}\right)$
$\frac{1+\cos\left(b\right)}{\sin\left(b\right)}+\tan\left(b\right)=\frac{1+\cos\left(b\right)}{\sin\left(b\right).\cos\left(b\right)}$
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