sin²(α-π/6)+sin²(α+π/6)-sin²α速求在线等
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sin²(α-π/6)+sin²(α+π/6)-sin²α速求在线等
sin²(α-π/6)+sin²(α+π/6)-sin²α速求在线等
sin²(α-π/6)+sin²(α+π/6)-sin²α速求在线等