$\lim_{x\to+inf\:}ln\:\left(1+x\right)e^{\left(-x\right)}$
$6x^2+5x-21$
$\int\:\:sec\left(3x^2\right)tan\left(3x^2\right)xdx$
$\frac{3n^{-4}}{n^3}$
$\pi\sin x+\pi=0$
$-7\:por\:8$
$a+2b+a-b$
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