$\frac{4x}{-4+x^2}=\frac{5}{x}$
$\int e^{-5}dx$
$1+216z^9$
$\frac{\sec\left(a\right)-\cos\left(a\right)}{\sin\left(a\right)}$
$\sqrt[5]{x^5}yz$
$\lim_{x\to r}\left(\frac{x^2-ax}{x^2-4}\right)$
$z+395=700$
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