The argument of the complex number \( \sin \frac{6 \pi}{5}+i\left(1+\cos \frac{6 \pi}{5}\right) ...
The argument of the complex number \( \sin \frac{6 \pi}{5}+i\left(1+\cos \frac{6 \pi}{5}\right) \) is
(A) \( \frac{6 \pi}{5} \)
(B) \( \frac{9 \pi}{10} \)
(C) \( \frac{5 \pi}{6} \)
(D) \( \frac{2 \pi}{5} \)
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