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2π
對於y=asinbx+c的形式的最小正週期為T=2π/b的絕對值故T=2π
2π,當1≥sinx≥1/2時,有意義,當-1≤sinx<1/2時,無意義,在坐標軸上那一段不畫,最小正週期還是2π不變的
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