$\frac{7}{2}x^3-\frac{3}{4}x^3$
$y^2+y-4$
$xy'=4x$
$\lim_{x\to0}\left(\frac{x}{1+sin^2\left(x\right)}\right)$
$\left(x^2+c\right)\left(x^2-7\right)$
$\frac{d}{dt}\left(\sqrt[6]{\frac{t}{9t+1}}\right)$
$x2+12\cdot36$
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