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**1. Homework Statement**

Show that the solution u(r,theta) of Laplace's equation (nabla^2)*u=0 in the semi-circular region r<a, 0<theta<pi, which vanishes on theta=0 and takes the constant value A on theta=pi and on the curved boundary r=a, is

u(r,theta)=(A/pi)[theta + 2*summation ((r/a)^n*((sin n*theta)/n)])

**2. Homework Equations**

**3. The Attempt at a Solution**I didn't now where to even begin. I am struggling and am requesting help in explaining what I do not understand. Thanks!