blob: 47912aa2f66bc000cdca0ff1921b2f4e6d111425 (
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\begin{tikzpicture}
\draw[->] (0,0) -- (6,0) node[right] {$x$} ;
\draw[->] (0,0) -- (0,5) node[above] {$y$} ;
\filldraw[fill=gray!30]
(1,0) node[below] {$a$}
-- (1,2)
cos (5,4) node[right] {$f(x)$}
-- (5,0) node[below] {$b$}
-- cycle ;
\draw (3,1) node {$\displaystyle \int_a^b f(x) \, \mathrm{d}x$} ;
\end{tikzpicture}
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