$\lim_{x\to\infty}\frac{x^x}{x+1}$
$\frac{1+8x^{4}-4x^{3}-2x}{4x^{3}-1}$
$3xy+5x-6y+2x-xy$
$-4x\le3x-5$
$cos\:t\:cot\:t\:=\:\frac{1-sin^2\:t}{sin\:t}$
$\sqrt{\sqrt[3]{x^2}}$
$x^5-40x^4$
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