$\left(x-4y^3\right)^2$
$45\cdot\frac{7}{9}$
$2a\:+\:3\:+\:4a\:+\:5$
$5^{x+2}=625$
$19x+12y-5x+13y+75$
$\frac{\left(\csc\:^2x\right)}{1+\tan\:^2\left(x\right)}=\cot\:^2\left(x\right)$
$\left(3a^3+2\right)\left(3a^3-9\right)$
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