$\int_{-\infty}^0\left(\frac{1}{\left(x-1\right)^2}\right)dx$
$\lim_{x\to\infty}\left(\frac{4e^{-x}}{ln\left(1+5e^{-x}\right)}\right)$
$\lim_{x\to90}\left(\frac{-cos\left(x\right)}{x-90}\right)$
$a^2+b^2-2b^2-3a^2+a^2+b^2$
$\lim_{x\to0}\left(\frac{\sin\left(2x\right)}{2}\right)$
$49y^2-4y+1$
$\lim_{x\to3.1416}\cos\left(4x\right)$
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