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For reference(maths):÷ ± √ ∛ ≡ ∞ ∫ ∠ ⊥ ≠ ≧ ≦ ∴ ∵ Σ λ π ·Δ α β γ λ μ ζ θ ψ ω φ ℃ ℉ ˚ ⇌ → δ Φ∀∃∇∈∋∏ ∘∣ ∥ ∩ ∪ ≈ ≒ ≤ ≥ ≮ ≯ ⊂ ⊃ ⊆ ⊇=======================================================請珍惜答題者的心血,勿隨便取消或棄置問題,多謝大家合作!
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