Duration: 1:11

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Passage
In some question of sets, we have to make the use of graphs.
\( \mathrm{P} \)
For example
\[
\begin{array}{l}
A=\left\{(x, y): y=e^{x}, x \in R\right\} \\
B=\{(x, y): y=-x, x \in R\}
\end{array}
\]

It is clear that \( y=e^{x} \) and \( y=-x \) intersect at one point.
Hence \( n(A \cap B)=1 \)
\[
A=\left\{(x, y): y=\sqrt{4-x^{2}}, x \in[-2,2]\right\}
\]
\( B=\{(x, y): y=|x|, x \in R\} \) Then \( n(A \cap B) \)
(1) 0
(2) 1
(3) 2
(4) 4


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