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1)對稱軸爲取最值的點即 1/3x+π/3=kπ+π/2,即:x=3kπ+π/2,此即爲對稱軸對稱中心爲sin(1/3x+π/3)=0的點,即1/3x+π/3=kπ得:x=3kπ-π,故對稱中心爲(3kπ-π,0)這裏k爲任意整數 2)對稱軸爲取最值的點即3x+π/6=kπ即x=kπ/3-π/18, 此爲對稱軸對稱中心爲cos(3x+π/6)=0的點,即3x+π/6=kπ+π/
2得:x=kπ/3+π/
9故對稱中心爲(kπ/3+π/9,0)這裏k爲任意整數
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