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Prove-that-R-n-1-3-n-1-sin-3-3-n-sin-4-




Question Number 83213 by ~blr237~ last updated on 28/Feb/20
Prove  that  ∀ θ∈R   Σ_(n=1) ^∞ 3^(n−1) sin^3 ((θ/3^n ))= ((θ−sinθ)/4)
ProvethatθRn=13n1sin3(θ3n)=θsinθ4

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