$\lim_{x\to0}\left(\frac{cos\left(2x\right)-\cos\left(4x\right)}{x^2}\right)$
$\lim_{x\to\infty}\left(\frac{5^n-3}{2^n-3}\right)$
$y^2-4y=\cos3a$
$\int\frac{e^x}{\left(1+x\right)^2}dx$
$xy^{-5}\left(xy^6-y^6+x^2y-xy-xy^{-5}z+3\right)$
$-214-5-10+30+40$
$2+5+4+5$
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