Linked Questions
20 questions linked to/from Can Reduce *really* not solve for x here?
3
votes
2
answers
3k
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Why doesn't Mathematica solve $x=\cos\,x$ properly? [duplicate]
Why doesn't Mathematica solve x == Cos[x] properly?
Both Solve and NSolve fail with the ...
- 1,539
0
votes
3
answers
5k
views
How do I solve for the roots of $\sin(x) - x^2=0$? [duplicate]
I have defined h[x] := Sin[x] - x^2. When I submit Solve[h[x] == 0, x], Mathematica tells me
Solve::nsmet: This system ...
- 1
2
votes
1
answer
482
views
Why Wolfram|Alpha can solve an equation but not Mathematica? [duplicate]
I want to numerically solve $$\cosh\left(\frac{1}{x}\right)-\frac{1}{x^2}\sinh\left(\frac{1}{x}\right)=0.$$
A strange thing is that Wolfram|Alpha it solves it perfectly, but Mathematica I have this:
...
- 151
2
votes
2
answers
109
views
How can I solve $\coth (2 x )=x $? [duplicate]
I have this equation $$\coth (2 x )=x $$ and I want to solve it to find $x$. The methods Solve and Reduce do not work.
Coth[2 x] == x
user73730
0
votes
2
answers
201
views
Solve $1/a - \sin(1/a)$ [duplicate]
I need to find $a$ from this equation:
Solve[(2*b)/a - 1/(n*π)*Sin[(2*n*π*b)/a] - 1/2 == 0, a]
but I get the response:
Solve::nsmet: This system cannot be ...
2
votes
1
answer
69
views
I need help solving this hyperbolic equation [duplicate]
I have some data and I'd like to calculate the radius of curvature. The formula is:
$$R_{oc}\space Sinh\left[\frac{D_{LSS}}{R_{OC}}\right]=\frac{s_*}{\theta_*}$$
Noting that $s_*$ is sh, $\theta_*$ ...
- 1,610
2
votes
0
answers
139
views
Why can't Mathematica solve this equation? [duplicate]
Possible Duplicate:
Can Reduce *really* not solve for x here?
Why can't Mathematica solve this equation?
...
- 61
0
votes
0
answers
69
views
Problem with solving an equation [duplicate]
I dont understand why Mathematica cannot solve this equation:
Solve[Log[x^2 + 5] + 0.5 x + 1 == 0, x]
I get this error message:
Solve::inex: Solve was unable to solve the system with inexact ...
0
votes
0
answers
52
views
Closed solutions for `FindRoot`, no solutions for `Reduce` or `Solve` [duplicate]
Reduce, Solve and FindRoot all appear to struggle with this:
...
- 8,920
0
votes
0
answers
25
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Why doesn't mathematica recognize the exponential expression with Solve but it will plot it written exactly the same way? [duplicate]
I can Plot these two functions written exactly this way and see intersection but Solve will not recognize the exponential expression. Please help me with feedback...
Solve[1/3Exp[-x/5]==Cos[x], x]
- 1
54
votes
4
answers
22k
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How do I work with Root objects?
I want to solve the trigonometric equation :
$$(3-\cos 4x )\cdot (\sin x - \cos x ) = 2.$$
I tried
Solve[(3 - Cos[4*x])*(Sin[x] - Cos[x]) == 2, x]
It returns the ...
- 4,533
16
votes
5
answers
878
views
Interlacing a single number into a long list
This seems like it should be a simple question, but I am running into some difficulty in doing this with Mathematica. Right now, I have a list like this:
...
- 3,744
17
votes
5
answers
4k
views
Solve symbolically a transcendental trigonometric equation and plot its solutions
I currently have the equation below for a beam with a hinge at various locations, the variable a can vary between 0 and 0.5.
$$
Tan\left( {a\sqrt \alpha } \right) + Tan\left\{ {\left( {1 - a} \right)\...
- 1,106
5
votes
4
answers
7k
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How to solve this logarithmic equation?
The equation
$$x^2\cdot\log_2\dfrac{3+x}{10}-x^2\cdot\log_{\frac{1}{2}}(2 + 3x)=x^2 - 4+2\cdot\log_{\sqrt{2}}\dfrac{3x^2+11x+6}{10}$$
has two solutions for x, namely 1 and 2. I tried
...
- 4,533
1
vote
2
answers
17k
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Solving simple transcendental equation [duplicate]
I would like to solve
Tan[x] == 1/x
Solve[] does not work, suggesting that there is no nice analytical solution for x.
Surprisingly, NSolve[] does not work ...
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