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Zeta sine (Posted on 2018-10-28) Difficulty: 4 of 5
What is the maximum value of the expression below?

sin x / 13 + sin 2x / 23 + sin 3x / 33 + ...

No Solution Yet Submitted by Danish Ahmed Khan    
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re(3): Solution (spoiler) | Comment 4 of 6 |
(In reply to re(2): Solution (spoiler) by Charlie)

Homing in on the maximum in one cycle shows the maximum to be about  0.994527 for approximately x= 1.32779
  Posted by Charlie on 2018-10-31 12:10:31

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