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函数f(x)=3sin(2x- π 3 )的图象为C,下列命题: ①图象C关于直线x= 11 12 π对称; ②函数f(x)在区间(- π 12 , 5π 12 )内是增函数; ③将y=sin(2x- π 3 )的图象上的点横坐标保持不变,纵坐标变为原来的3倍即可得到图象C; ④图象C关于点( π 3 ,0)对称. 其中,正确命题的编号是______.(写出所有正确命题的编号)
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAAA5ElEQVRYR2NkGGDAOMD2M+B0wKpVq9huv/jbxPD/fxwDA4MkhQ59zsDIuEhVgrkuLCzsF7JZOB3QOml5B8P//+UUWoyqnZGxszovsoI4B0xc9gyfzxmZmb2rcsK3IRvWMWm599///7fgcfTz6vwoKWId8B+f75kZGX0q8iK3kugAhur8KJRQxx0FE5fhdQC5UTPqgNEQGA2B0RAYDYHREBgNgaETAuTW96TqG7yt4tbRFhGRIQBqHTP9+8dIoDUMTxqk5AK8zXKYiaDWMYhNpANIaJYPdMdkwLtmpOZnctUPeDkAAP6tmiH1ggTLAAAAAElFTkSuQmCC)
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