$\int_0^{\infty}\left(\frac{10}{e^{5x}}\right)dx$
$-x+1>-2$
$2\sin^21=0$
$x^2-5x-28$
$16+72+8+32+56\cdot8$
$\frac{x^2-sen^2x}{x^2sen^2x}$
$2\left(x-1\right)+x\left(x-1\right)=0$
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