TMUA 2020 Paper 2 Q15 — Worked Solution

P2·Trigonometry, Sequences & Series·7.0Official · 2020 · Q15

trig-sumperiodicitynecessary-sufficient

Which one of the following is a necessary and sufficient condition for

k = 1 \sum n sin (\frac{k π}{3}) = \frac{3}{2}

to be true?

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