# Spherical Harmonics

## Homework Statement

Hi!!! I need help with this. I have to calculate the expression of a function using spherical harmonics. The relevant equations are given below. An example of a function can be f(theta,phi) = sin(theta)... Can you help me to calculate de coeficients and to express the function? Thanks.

## Homework Equations

View attachment formulas.doc

## The Attempt at a Solution

gabbagabbahey
Homework Helper
Gold Member
Hola pgerlein. Welcome to PF Why don't you show us what you've tried for your example ($f(\theta,\phi)=sin(\theta)$) and we'll know how to help you better.

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I can´t understand the use of this base (spherical harmonics). If I solve the ecuation that gives the coefficients value, how can I express the function in terms of the spherical harmonics?

How would you express a function in terms of a Fourier series, for example? Essentially it's the same idea when you write any function in terms of an infinite series of basis functions.