$1+\left[5+4-3-7+1-9-\left[5+8-7-\left(7+8+6-9-23\right)-5\right]+3\right]$
$x^2+\frac{3}{4}x=0$
$\cos\left(44\right)=\frac{16}{x}$
$-8+1+-1+6$
$3\left(-2f-3\right)+2\left(f+2\right)$
$\lim_{x\to\infty}\left(\frac{x^2}{\sqrt{x^2+x^4}}\right)$
$2x+1<3x-1$
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