$\sqrt[2]{x^2+16}=5$
$\sqrt{25}\cdot\sqrt{k^2+4}$
$\cos x\cdot\sin2x-\sin x=0$
$\log_{10}\left(y\right)-2\log_{10}\left(y-1\right)$
$a^2-5a+9$
$\frac{d^2}{dx^2}\left(f\left(x\right)=\sqrt{x}e^{-x}\right)$
$-2200-\left(-3500\right)$
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