$\left(7z^2-\frac{a^2}{5}\right)^2$
$5z+5z-5z$
$a^2b^2-49c^2$
$\frac{x-1}{2-x-x^2}$
$y=\left(2x+7\right)\left(3x-1\right)$
$\cot\left(x\right)=\:-\frac{5}{12}$
$\frac{\left(1+\tan\left(x\right)\right)^2-2\left(\tan\left(x\right)^2\right)}{1+\left(\tan\left(x\right)^2\right)}$
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