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f(x)=√sin²;x(1-sin²;x) =√sin²;cos²;x =|sinxcosx| =1/2|sin2x| sin2x週期是2π/2=π 而|sin2x|是把x軸下方部分乙x軸為對稱軸翻折180度 所以週期是sin2x的一半 所以T=π/2
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