\(\int_{-\pi / 4}^{\pi / 4}\) sin2x dx = ________.

1
\(\frac{\pi}{4}\)
2
\(\frac{\pi}{4}-\frac{1}{2}\)
3
\(\frac{\pi}{4} - 1\)
4
\(\frac{\pi}{4}+\frac{1}{2}\)

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