2sin（πx/4-π/4）+6＜2sin（πx/4-3π/4）+8的解集
sin(πx/4-π/4)-sin(πx/4-3π/4)
2sin（πx/4-π/4）+6＜2sin（πx/4-3π/4）+8
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相关问题
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