$3x^4+9x^3+9x^2+9x+6$
$14m^2+\:7mn$
$\left(2a-7\right).\left(2a+3\right)$
$\frac{dy}{dx}=-y-x^4$
$\lim_{x\to0}\left(\frac{e^{4x}-1}{e^{3x}}\right)$
$\left(\frac{t}{3}+\frac{2}{5}p\right)^2$
$\left(7a^2b^3+\:5x^3\right)^3$
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