$\frac{d}{dx}\left(\frac{x^4\cdot\left(x+1\right)^2}{\left(x-3\right)^3}\right)$
$\frac{x^4+3x+x^3+10}{x^2+2x+1}$
$z=\left(\frac{2+3i}{3+i}+\frac{1}{i}\right)$
$-16+\left(12-1\right)\left(5-6\right)$
$y^3+sy^2$
$4\sec\left(2x\right)-3=0$
$x+5=3x-1$
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