$-1+\frac{45}{15}$
$\left(19^8\right)^4$
$\sec\left(\pi-x\right)=-\sec\left(x\right)$
$\left(sin\:\theta\:+\:cos\:\theta\right)^2=1\:+sin29$
$n^3+\frac{n^4+n^2}{2}-n^2-n$
$8.3+1.6u+9u-7.8u-3-4.6$
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