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Best answer by Werner_E

Guess you found out that uncle Wolfram isn't perfect, either.

You get different solutions depending on if you chose 6<x<10 or 6<x<13 and you get the same solution twice - too bad!

For another funny effect you may click on "More digits". All in a sudden Wolfram offers two more solutions and both are not within the constraints.

Looks like the world isn't perfect and math progs aren't, too 😞

 

 

3 replies

23-Emerald IV
November 1, 2018

This should do it, together with all help you've received over the past days explaining the ins and outs of dealing with exp(i) in various forms:

LM_20181101_cot(x).png

 

Success!

Luc

lvl10720-TurquoiseAuthor
20-Turquoise
November 1, 2018

Luc, I guess there is a misunderstanding my question :

IIa.PNGI need a explanation about how to get the second solution, x = 6.237916547633475

see : https://www.wolframalpha.com/input/?i=solve+cot(x)%2Be%5E(x-pi)-1%2F((e%5E(pi))*((e%5E(x*i))%5Ei))%3D0+for+6%3Cx%3C10

Best Regards.

lvl10720-TurquoiseAuthor
20-Turquoise
November 1, 2018

I need help explanation about the Missing solution - How to get the second solution x = 6.237916547633475 from that formula, from that hint.

Best Regards.

lvl10720-TurquoiseAuthor
20-Turquoise
November 1, 2018

Or : I need help explanation about the Missing solutions - How to get the other solutions from 6<x<13,  from that formula, from that hint.

Werner_E25-Diamond IAnswer
25-Diamond I
November 2, 2018

Guess you found out that uncle Wolfram isn't perfect, either.

You get different solutions depending on if you chose 6<x<10 or 6<x<13 and you get the same solution twice - too bad!

For another funny effect you may click on "More digits". All in a sudden Wolfram offers two more solutions and both are not within the constraints.

Looks like the world isn't perfect and math progs aren't, too 😞

 

 

lvl10720-TurquoiseAuthor
20-Turquoise
November 2, 2018

Yes. I guess so, Werner.Smiley HappySmiley HappySmiley Happy  and anyway I guess we would have to solve it "by hand" with root function and guess values. And another example :

https://www.wolframalpha.com/input/?i=solve+tan(x)%2Be%5E(x-(pi%2F2))-1%2F((e%5E(pi%2F2))*((e%5E(x*i))%5Ei))%3D0

b1.PNGb2.PNGRegards.