$x^{2}-4x-5$
$2^4\cdot5^5\cdot2^3$
$xy'+2xy=10x$
$\lim_{x\to2}\left(\frac{\cos\left(x-\frac{\pi}{2}-2\right)}{ln\left(x-1\right)}\right)$
$2^x=2^{-x-4}$
$\frac{5x^5-7x^4+5x^2-2}{2x^2+1}$
$5\int x^3dx$
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