If \( \overrightarrow{\mathrm{u}}=\overrightarrow{\mathrm{a}}-\over...
If \( \overrightarrow{\mathrm{u}}=\overrightarrow{\mathrm{a}}-\overrightarrow{\mathrm{b}} \) and \( \overrightarrow{\mathrm{v}}=\overrightarrow{\mathrm{a}}+\overrightarrow{\mathrm{b}} \), and \( |\vec{a}|=|\vec{b}|=2 \), then
\( \mathrm{P} \)
W \( |\overrightarrow{\mathrm{u}} \times \overrightarrow{\mathrm{v}}| \) is equal to
(1) \( 2 \sqrt{16-(\vec{a} \cdot \vec{b})^{2}} \)
(2) \( \sqrt{16+(\vec{a} \cdot \vec{b})^{2}} \)
(3) \( 2 \sqrt{4-(\vec{a} \cdot \vec{b})^{2}} \)
(4) \( \sqrt{4-(\vec{a} \cdot \vec{b})^{2}} \)
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