$-8+-18-\left(-25\right)$
$\lim_{x\to\infty}\left(\frac{sin\left(x\right)}{x}\right)^{\frac{20}{x^2}}$
$89-\left(-900\right)$
$+1+4-5+2$
$\cos\alpha\cdot sen2\alpha=sen\alpha$
$x+e^{-2x}\cdot3x$
$\int_1^{\infty}\left(\frac{2x^2+5x+14}{x\left(2x+5\right)}\right)dx$
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