Unable to solve using vpasolve

2021 4 26
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更新时间：2021 4 26
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My equation is sin(A)-sin(1.62)*exp(-(2*pi+A-1.62)/18.85.
I write it and use 'vpasolve' to find the solutions.
Unfortunately, it doesn't give me the right ans Equation at Slide 23
How can I get the solution I want.
Code:
syms A
vpasolve(sin(A)-sin(1.62)*exp(-(2*pi+A-1.62)/18.85) == 0,A,3)

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Walter Roberson
Walter Roberson 2021-4-26
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Ran in:
syms A
eqn = sin(A)-sin(1.62)*exp(-(2*pi+A-1.62)/18.85)
eqn = 
vpasolve(eqn == 0,A,1)
ans = 
0.84178630519911388705537692607065
fplot(eqn, [-10 10])
There are multiple roots.
There is a lower bound around -4.663 with a second root around -4.656. There is, however, no upper bound.

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