$\lim_{x\to1}\left(\frac{3-3x}{2-\sqrt{x+3}}\right)$
$3x^2=5+2x$
$\int\frac{1+x}{\sqrt{x}+1}dx$
$\frac { 1 } { 95 } - 4 n + 6$
$\lim_{x\to2}\left(\frac{3x^2-6x}{x^2-x-2}\right)$
$\int3x\sqrt{5+x^2}dx$
$\left(\frac{1}{2}a^2+8\right)\left(\frac{1}{2}a^2-4\right)$
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