$\left(2a-b-c\right)\left(2a+b+c\right)$
$\log\left(3\right)+\log\left(x-1\right)=\log\left(2x\right)$
$\frac{4-13x-15x^3}{5x^2+2}$
$\lim_{n\to\infty}\left(1+\frac{\left(2^n-1\right)}{2^n}\right)$
$9o+6=60$
$\left(5c^5a^6b^5\right)^2$
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