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Geometric Sequenceshard
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Consider the sequence an=sin⁡n(θ)a_n = \sin^n(\theta)an​=sinn(θ). For which values of θ\thetaθ does the series ∑n=1∞an\sum_{n=1}^{\infty} a_n∑n=1∞​an​ converge to exactly 111?