$-7ab\left[xa^7+ya^5-1\right]$
$\lim_{x\to\infty}\frac{x\sin\left(2x\right)}{x^2+1}$
$\left(\frac{Sen\left(\theta\right)+cos\left(\theta\right)}{cos\left(\theta\right)}\right)$
$\left(3x^2+8y^3\right)^2$
$\left(3a^2-2b\right)^3$
$2y-3xy+4xy^{2}$
$\left(-7+3-7\right)\left(+3\right)$
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