this is for holding javascript data
Yitong Li edited untitled.tex
almost 8 years ago
Commit id: 325bf35d056087000581594907d10a80c1364109
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From (b) and (c), we got $$- \int_ {D} f dA \leq \int_ {D} \left|f \right|dA$$
Therefore, we can conclude that
$$\left| \int_ {D} f dA\right| \leq \int_ {D} \left|f \right|dA$$
9.