Вычислите \(sin\alpha,\) если \(tg\alpha=\sqrt{\frac{2}{7}}, 6\pi\lt \alpha\lt \frac{13\pi}{2}.\)

• \(\frac{\sqrt{2}}{3}\)
• \(\frac{\sqrt{2}}{2}\)
• \(-\frac{\sqrt{2}}{2}\)
• \(-\frac{\sqrt{2}}{3}\)