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Aug 19, 2022 at 15:32 comment added A.J.H I have posted the question
Aug 19, 2022 at 15:16 comment added Bob Hanlon So post a new question, show the exact code you are using, and explain what specific errors that you are getting.
Aug 19, 2022 at 15:07 comment added A.J.H when i apply the code for the new equation it does not give me any solution and give an error
Aug 19, 2022 at 15:05 comment added Bob Hanlon Changing the equation does not fundamentally change the question. The approaches given in the answers still apply. So what have you tried and what problems have you encountered?
Aug 19, 2022 at 14:37 comment added A.J.H ArcTan[1/dSqrt[(a+b)/(1-b)]]-(Vi/h)*Integrate[Sqrt[(1+(x/h)^2)^(-1)-b],{x,(h/2)*Log[b],0}]+(Pi/4)+mPi=0 .... there is an eddit in the equation can you see it please?!
Aug 18, 2022 at 5:07 history edited Bob Hanlon CC BY-SA 4.0
Added optional use of FindRoot
Aug 18, 2022 at 5:05 comment added Bob Hanlon Then use root[Vi_?NumericQ] := b /. FindRoot[expr[Vi, b] == 0, {b, 0.3}]
Aug 18, 2022 at 4:17 comment added A.J.H yes i think the problem on NSolveValues , the version is 11.2
Aug 17, 2022 at 19:07 comment added Bob Hanlon If you copy and pasted my code and it didn't work, there must be a difference with Mma versions, presumably with NSolveValues. I used v13.1, what version are you using?
Aug 17, 2022 at 15:45 comment added A.J.H I tried your way to solve the equation but it does not give me as you have written here
Aug 17, 2022 at 15:30 history answered Bob Hanlon CC BY-SA 4.0