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(sinα-sinβ)^2+(cosα-cosβ)^2=sin²;α-2sinαsinβ+sin²;β+cos²;α-2cosαcosβ+cos²;β=2-2(cosαcosβ+sinαsinβ)=2-2cos(α-β)=2-2[1-2sin²;(α-β)]=4sin²;(α-β)感覺你在(sin…
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