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Gaokao Math Practice Question

为了得到函数 $y=2 \sin 3 x$ 的图象, 只要把函数 $y=2 \sin \left(3 x+\frac{\pi}{5}\right)$ 图象上所有的点 ($\qquad$)

  1. A.向左平移 $\frac{\pi}{5}$ 个单位长度
  2. B.向右平移 $\frac{\pi}{5}$ 个单位长度
  3. C.向左平移 $\frac{\pi}{15}$ 个单位长度
  4. D.向右平移 $\frac{\pi}{15}$ 个单位长度

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