(1+cos π/6)(1+cos π/3)(1+cos 2π/3)(1+cos 7π/6)
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(1+cos π/6)(1+cos π/3)(1+cos 2π/3)(1+cos 7π/6)
=(1-cos^2π/6)(1-cos^2π/3)
=(1-3/2)(1-1/4)
=(-1/2)(3/4)
=-3/8
=(1-cos^2π/6)(1-cos^2π/3)
=(1-3/2)(1-1/4)
=(-1/2)(3/4)
=-3/8
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