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tmua.fyi Mock Paper 1 · Q5

Paper 1TrigonometrySequences & series

Find ∑n=0∞cos⁡(nπ)3n\displaystyle\sum_{n=0}^{\infty}\frac{\cos(n\pi)}{3^n}.

A32\frac32
B23\frac23
C34\frac34
D12\frac12
E94\frac94

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