$5x^3+4x^2-7+x-\:\left(x+5x^3-4x^2+7\right)$
$1\ge\frac{3-2x}{1+x}$
$\lim_{a\to0}\left(\frac{sin\:a^2}{a}\right)$
$3x+4y+11w-2x+3y-8w$
$\frac{1}{y}y^'=\frac{1}{\sqrt{x^2+1}}$
$\lim_{x\to0}\left(2^x-x^{10}\right)$
$\frac{a^4-a^2-1}{a^2+1}$
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