Mister Exam
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- Taylor Series Step by Step
- Fourier series step by step
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- Product of series
-
How to use it?
- Sum of series:
- x^n/n^2
-
sin(1/n^2)
- x^(n-1)/factorial(n-1)
- z^(n+1)/factorial(n+1)
-
Identical expressions
- sin(one /n^ two)
- sinus of (1 divide by n squared )
- sinus of (one divide by n to the power of two)
- sin(1/n2)
- sin1/n2
- sin(1/n²)
- sin(1/n to the power of 2)
- sin1/n^2
- sin(1 divide by n^2)
Sum of series sin(1/n^2)
The solution
You have entered
[src]
oo ____ \ ` \ /1 \ \ sin|--| / | 2| / \n / /___, n = 1
$$\sum_{n=1}^{\infty} \sin{\left(\frac{1}{n^{2}} \right)}$$
Sum(sin(1/(n^2)), (n, 1, oo))
The radius of convergence of the power series
Given number:
$$\sin{\left(\frac{1}{n^{2}} \right)}$$
It is a series of species
$$a_{n} \left(c x - x_{0}\right)^{d n}$$
- power series.
The radius of convergence of a power series can be calculated by the formula:
$$R^{d} = \frac{x_{0} + \lim_{n \to \infty} \left|{\frac{a_{n}}{a_{n + 1}}}\right|}{c}$$
In this case
$$a_{n} = \sin{\left(\frac{1}{n^{2}} \right)}$$
and
$$x_{0} = 0$$
,
$$d = 0$$
,
$$c = 1$$
then
$$1 = \lim_{n \to \infty} \left|{\frac{\sin{\left(\frac{1}{n^{2}} \right)}}{\sin{\left(\frac{1}{\left(n + 1\right)^{2}} \right)}}}\right|$$
Let's take the limit
we find
$$\sin{\left(\frac{1}{n^{2}} \right)}$$
It is a series of species
$$a_{n} \left(c x - x_{0}\right)^{d n}$$
- power series.
The radius of convergence of a power series can be calculated by the formula:
$$R^{d} = \frac{x_{0} + \lim_{n \to \infty} \left|{\frac{a_{n}}{a_{n + 1}}}\right|}{c}$$
In this case
$$a_{n} = \sin{\left(\frac{1}{n^{2}} \right)}$$
and
$$x_{0} = 0$$
,
$$d = 0$$
,
$$c = 1$$
then
$$1 = \lim_{n \to \infty} \left|{\frac{\sin{\left(\frac{1}{n^{2}} \right)}}{\sin{\left(\frac{1}{\left(n + 1\right)^{2}} \right)}}}\right|$$
Let's take the limit
we find
True
False
The rate of convergence of the power series
The answer
[src]
oo ____ \ ` \ /1 \ \ sin|--| / | 2| / \n / /___, n = 1
$$\sum_{n=1}^{\infty} \sin{\left(\frac{1}{n^{2}} \right)}$$
Sum(sin(n^(-2)), (n, 1, oo))
The graph
Examples of finding the sum of a series
- The Sum of the Power Series
x^n/n
(x-1)^n
- Factorial
1/2^(n!)
n^2/n!
x^n/n!
k!/(n!*(n+k)!)
- Flint Hills Series
csc(n)^2/n^3
- Basel problem
1/n^2
1/n^4
1/n^6
- Harmonic series
1/n
- Grandi's series
(-1)^n
- Alternating series
(-1)^(n + 1)/n
(n + 2)*(-1)^(n - 1)
(3*n - 1)/(-5)^n
(-1)^(n - 1)*n/(6*n - 5)
- Newton–Mercator series
(-1)^(n + 1)/n*x^n
- Exam the series for convergence
(3*n - 1)/(-5)^n