化简cos^2(a)+cos^2(a+π/3)-cosacos(a+π/3)
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化简cos^2(a)+cos^2(a+π/3)-cosacos(a+π/3)
化简cos^2(a)+cos^2(a+π/3)-cosacos(a+π/3)
化简cos^2(a)+cos^2(a+π/3)-cosacos(a+π/3)
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