$\frac{x^4+2x^3-x^2}{x^2}$
$-5n+17\left(11n-4\right)$
$\lim_{x\to\infty}\left(\frac{\ln3x}{5^x}\right)$
$\int\frac{\left(sinax.secax\right)}{a}dx$
$6\cdot12-7$
$f\left(x\right)=x^2-5x\:;\:x=3,\delta\:x=0.3$
$3x+1>-2$
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