$\left(\sqrt{5}-4\right)\left(\sqrt{5}+4\right)$
$-2x+4=4x-20$
$dy=3x^2y^2dx$
$-2\csc^2\left(0\right)\infty+2\cdot\cot^2\left(0\right)$
$\lim_{x\to0}\left(\frac{t^2+t}{e^t-1}\right)$
$x^{-n}=\frac{1}{x^n}$
$\left(8^3\right)+\left(2\cdot8^2\right)-\left(-8\right)+3$
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