$\frac{-y^2yz}{2}$
$\frac{n}{4}=20$
$\int\frac{5}{x\sqrt{x^2+4}}dx$
$2y^3-2y^3+2y+4-7x+4x-4y$
$\lim_{x\to4}\left(\frac{\sqrt{x+1}-2}{x-3}\right)$
$\int cos6x\cdot6dx$
$\left(\frac{x^3}{y^{-2}}\right)^{-3}$
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