$\left(4mn\:+\:7pq\right)\left(4mn\:-\:7pq\right)$
$\left(3y^3+y\right)^2$
$\tan\left(-x\right)\cdot\sec\left(-x\right)\cdot\cot\left(x\right)$
$\frac{z}{3}=\frac{x^2}{1.5}+\frac{\left(y-4\right)^2}{6}$
$\:6k\:-\:9k$
$\left(2a-c\right)\left(3a-c\right)$
$3^2+\left(-2\right)^2$
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