$-49\cdot18$
$\left(3x^2-x+1\right)\left(2x^3-1\right)$
$csc^2a-2$
$\lim_{x\to-2}\left(x^3-2x^2+4x+8\right)$
$72a^4-72a^33+18^2$
$3s^3x\:\:2s\:^{\:3}$
$-27-\left(-30\right)$
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