$\frac{x}{3}-x$
$\frac{cot\left(x\right)}{sin\left(2x\right)}=\frac{1}{\:\left(1\:+\:cot^2\left(x\right)\right)}$
$\frac{\left(senx+cosx\right)}{sen2x}$
$\left(-2\right)^2\cdot\left(-2\right)^3\cdot\left(-2\right)^4$
$15+2b^2-8b^2$
$\lim_{x\to\infty}\left(\frac{x^2+5}{3^x}\right)$
$-87-x=45$
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