$\frac{7r^2}{4r^3}$
$4\cdot7m^6$
$4^3-2^3+2\cdot 4\cdot 2$
$1+\frac{1}{\tan^2x}=\csc^2x$
$-x^3+6x^2-\frac{45x}{4}+\frac{27}{4}$
$10\left(-4\right)\left(9\right)$
$\left(n\:+\:3\right)\left(n\:-\:3\right)$
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