How can we put mathematical symbols such as sqrt, exponents and subscripts into the Yahoo Answer block?

I use the copy-paste method. Over time, I've compiled a list of symbols that work here on Yahoo Answers. I actually have this stored as a Facebook note as well as backed up on a USB drive. I won't be needing to search for all of these again.

√ ² ³ · ° • 10²³ ℚ ℝ ℂ ℍ ℙ ℤ ℕ ∪ U ∩ ∅ =

10⁻⁶ K⁻¹ 10⁻³ ²⁺ ≃ ∈ ≠ π ± ∞ θ → ≤ ∫ ≥

subscripts ₀ ₁ ₂ ₃ ₄ ₅ ₆ ₇ ₈ ₉

superscript ⁰ ¹ ² ³ ⁴ ⁵ ⁶ ⁷ ⁸ ⁹

∃ ∧ ∠ ∨ ∩ ⊂ ⊃ ∪ ⊥ ∀ ∞ Σ

½ ⅓ ⅔ ¼ ¾ ⅛ ⅜ ⅝ ⅞

⟨ φ ψ α β ⟩ Σ σ τ α υ ϵ ∘ ¢ € £

If you have an iMac, download the Ukelele to program symbols into your keyboard.