$\tan\left(x\right)=40$
$16\:-\:n^2\:$
$\left(16a^{-3}b^0c^{-2}\right)^0$
$x^4+x^3-19x^2-49x-30$
$\left(\sqrt{x}-3y\right)\cdot\left(\sqrt{x}+3y\right)$
$2x^2-3x+2;\:x=-2$
$\int\left(te^{-\frac{1}{3}}\right)dt$
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