<jupyter_start><jupyter_text>This is a title  This is a small title This is a sentence $\frac{d}{dx}\left( \int_{0}^{x} f(u)\,du\right)=f(x)$ ${\frac {d}{dx}}\arctan(\sin({x}^{2}))=-2\,{\frac {\cos({x}^{2})x}{-2+\left (\cos({x}^{2})\right )^{2}}}$<jupyter_code>from IPython.display import YouTubeVideo
YouTubeVideo('lyb4gau3LyI')<jupyter_output><empty_output>
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