📋 Formulario

Complete Theory

Worked Examples

Example 1Radius of convergence with two methods
Example 2Taylor expansion of exsinxe^x\sin x
Example 3Fourier series of a square wave — convergence and Gibbs
Example 4RLC circuit with Laplace
Example 5Fourier series of f(x)=x2f(x)=x^2 and Parseval identity

Exercises with Solutions

Exercise 1Radius of convergenceMedium
📋 Problem to solve
Find the radius of convergence of n=1nnn!xn\displaystyle\sum_{n=1}^\infty \frac{n^n}{n!} x^n.
Exercise 2Taylor seriesMedium
📋 Problem to solve
Expand f(x)=arctanxf(x) = \arctan x in Maclaurin series up to 5th order.
Exercise 3FourierHard
📋 Problem to solve
Find the Fourier series of f(x)=xf(x)=|x| on [π,π][-\pi,\pi] (period 2π2\pi).
Exercise 4LaplaceHard
📋 Problem to solve
Solve y+4y=sinty'' + 4y = \sin t, y(0)=0y(0)=0, y(0)=1y'(0)=1 with Laplace.
Exercise 5Power seriesMedium
📋 Problem to solve
Compute n=0(1)n3n(2n)!\displaystyle\sum_{n=0}^\infty \frac{(-1)^n}{3^n (2n)!}.
Exercise 6FourierHard
📋 Problem to solve
Prove the identity n=11n2=π26\displaystyle\sum_{n=1}^\infty \frac{1}{n^2} = \frac{\pi^2}{6} using the Fourier series of f(x)=x2f(x)=x^2.
Exercise 7LaplaceMedium
📋 Problem to solve
Solve y+3y=ety' + 3y = e^{-t}, y(0)=2y(0)=2 with Laplace.