$\left(\sqrt{x}-3\right)^4$
$5+\sec\left(x\right)=9-7\sec\left(x\right)$
$\lim_{x\to\infty}25\cdot sin\frac{5}{x}$
$a-1\cdot a+3$
$4-36b+81b^2$
$\left(2x+7\right)+\left(2x+7\right)+\left(2x\right)+\left(2x\right)$
$\frac{24a^6}{6a^4}$
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