$\lim_{x\to\infty}\left(\sqrt{\frac{3x^2-3x+1}{2x^2-2}}\right)$
$\left(a-x\right)\left(a+y\right)$
$a^6-25b^4$
$12\cdot\frac{3}{4}$
$\frac{-2x^3+12x-4}{x-2}$
$x\sqrt{x}+\sqrt{x}$
$cosx=\frac{2cos^2xcscx}{2cos^2xcotx+sin2x}$
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