βΊββ½β π(βππ©ππ) = β ππ£ππ€π€β ββΎβΊβ
Ξ¨(rβ, t) = R(rβ, t) Β· eβ±Λ’β½Κ³ββΊα΅βΎ/α΅Έ | eβ±αΆΏ = cos(ΞΈ) + isin(ΞΈ)
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βΊββ½β π(βππ©ππ) = β ππ£ππ€π€β ββΎβΊβ right away.