$x ^ { 2 } + 6 x y + 9 y ^ { 2 }$
$\lim_{x\to-2}\left(\frac{x+2}{1-\sqrt{x+3}}\right)$
$-2^7$
$\frac{55x}{11^2}$
$\frac{5}{3x+3}+\frac{20}{2-2+\frac{y}{x-1}}$
$2x^4-16x^2+30$
$\int\left(\frac{26}{xln\left|5x\right|}\right)dx$
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