$x^4+7x^2-30$
$\left(x+3y\right)^2\:\left(2x\:-\:3y\right)^2$
$\lim_{x\to\infty}\left(\frac{cos3x}{x+3}\right)$
$\left(2x+1\right)+\left(2x+4\right)$
$\left(a^4-5\right)\left(5a^4+11\right)$
$3x^2+14x+8$
$-29\:.\:3$
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