$\lim_{x\to\infty}\left(\frac{x^2}{cos^2\left(x-1\right)-\left(x+1\right)^2}\right)$
$\int-20x^{-5}dx$
$x^2+x+0$
$6sx+6sy$
$4-2\sin\left(x\right)=3$
$\left(20y^3\right)\left(-7y^2\right)$
$sin4x=0$
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