Chapter 2, Problem 2.6P

A plane wall of thickness 2L has internal heat sources whose strength varies according to

${\stackrel{\dot{}}{q}}_G={\stackrel{\dot{}}{q}}_o\cos \left(ax\right)$

Where ${\stackrel{\dot{}}{q}}_o$ is the heat generated per unit volume at the center of the wall $\left(x=0\right)$ and a is a constant. If both sides of the wall are maintained at a constant temperature of $T_w$, derive an expression for the total heat loss from the wall per unit surface area.