$3.\:-2+5.4$
$\left(4ab\:3\:-\:8a\:2\:b\:2\:+\:9ab\:-\:15\:ab\:2\:\right)$
$\lim_{x\to-2}\left(x^2+7x-6\right)$
$\left(3z+\frac{5}{4}xy\right)^2$
$\tan\left(t\right)=\frac{-12}{5}$
$5x^2+x^4+4$
$\left(\frac{-40}{x}\right)^2$
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