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Question Number 74622 by Raxreedoroid last updated on 27/Nov/19

$$\mathrm{Expand}$$$$1+\frac{2}{3}\cdot (\underset{k=1}{\sum ^{n-1}}\left[cos\left(\frac{2\pi }{3}x\right)\right]+2n-2)$$

Commented by Raxreedoroid last updated on 28/Nov/19

$$\mathrm{No}\mathrm{its}\mathrm{just}\mathrm{to}\mathrm{clarify}\mathrm{whats}\mathrm{inside}\mathrm{sigma}$$

Commented by mind is power last updated on 28/Nov/19

$$\left[\cos \left(\frac{2\pi \mathrm{k}}{3}\right)\right]\mathrm{is}\mathrm{floor}\mathrm{function}?$$

Commented by JDamian last updated on 28/Nov/19

$$Haveyourealizedthereisno\mathit{k}inthesum?$$

Commented by Raxreedoroid last updated on 01/Dec/19

$$\mathrm{ops}\mathrm{sorry}\mathrm{I}xandn\mathrm{suppose}\mathrm{to}\mathrm{be}k$$

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