$3.2-3\left(\frac{2}{5}\right)$
$\:f\left(x\right)=\frac{x}{2x-4}$
$16a^2+24ab+96b^2$
$2+3x+8x^2+4x+5+x^2$
$\int\:\sin\:^72x\cos\:^2xdx$
$2^4.2^1.2^2$
$4000\:.\:-8$
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