$\left(\frac{7}{4}x-\frac{3}{5}\right)\left(\frac{7}{4}x+\frac{3}{5}\right)$

$\left(12m+5n\right)+\left(5mn-8n\right)+\left(6mn-20m\right)$

$=\frac{9}{5}n^{2\left(y-3\right)-1}m^{2}$

$p\left(x+q\right)=r$

$\frac{\left(2x^2+26x-7\right)}{\left(x+7\right)}$

$\cos2\left(\frac{1}{4}\pi\right)$

$\left(57\right)\cdot\left(93\right)\cdot\left(-5\right)$