Question: Contrudiction between plot and NextZero

Wonderful.mw

Hi all

 

I don't know what is its meaning???

 

The plot and the solved Zero-roots aren't coincident with each other...

 

Zero-roots: 7.532332868 Wheras from the plot we noticed that there's a root near 14...

 

And why this Code can't find other Zero-roots?

 

Thanks a lot

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