$4xy'=3yx^3$
$\lim_{x\to0}\left(\frac{\left(e^{2x}-1+x\right)}{x^2}\right)$
$\int x^2\sec^3\left(x^3\right)dx$
$\left(x^2-9\right)\left(x^4+9x^2+81\right)$
$-8=4.x$
$12x^2-120xy+100y^2$
$\frac{ax^{4}+bx^{3}+5x^{2}4x+1}{2x^{2}+x+1}$
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