化简 sin²x+sin²(x+2π/3)+sin²(x-2π/3)
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化简 sin²x+sin²(x+2π/3)+sin²(x-2π/3)
化简 sin²x+sin²(x+2π/3)+sin²(x-2π/3)
化简 sin²x+sin²(x+2π/3)+sin²(x-2π/3)
sin²x+sin²(x+2π/3)+sin²(x-2π/3)
化简 sin²x+sin²(x+2π/3)+sin²(x-2π/3)
化简 sin²x+sin²(x+2π/3)+sin²(x-2π/3)
化简 sin²x+sin²(x+2π/3)+sin²(x-2π/3)
sin²x+sin²(x+2π/3)+sin²(x-2π/3)