$\left(3k-4\right)\left(3k+4\right)$
$\left(y\:-\:7\right)\left(y+4\right)$
$96x-8$
$\frac{\cos^2\left(x\right)}{\sin^2\left(x\right)}+\tan\left(x\right)\cot\left(x\right)$
$\left(15a-16b\right)^2$
$\lim_{x\to0}\left(\frac{sen\left(4x\right)}{cos\left(7x\right)}\right)$
$11\left(-3\right)^3$
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