$\left(2\sqrt{x+3}\right)^2$
$5m\cdot\left(-2n^2\right)$
$\left(5m-5n\right)\left(5m+2n\right)$
$2-\frac{8}{3}=\frac{3x-5}{3x}$
$10s^2+5s+10$
$4\cos\left(x\right)^2=3-4\sin\left(x\right)$
$\frac{\left(5x-2\right)}{2x+1}\ge-2$
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