$\int\frac{3x^2+x-1}{\left(x^2-5x+6\right)}dx$
$5^0\cdot5^2$
$\lim_{x\to\infty}\left(\frac{4x^4+5}{\left(x^2-2\right)\left(2x^2-1\right)}\right)$
$x ^ { 2 } + 3 x > 4$
$cos\:5x\:cos\:4x$
$2\arctan\left(e^{\infty}\right)-2\arctan\left(e\right)$
$x^2+2ax+a^2$
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