6.2.5 \(u(0)=0,u\left ( L\right ) +u^{\prime }(L)=0\)

For eigenvalue

For eigenfunctions

\[ \{\sin (2.02876 x),\sin (4.91318 x),\sin (7.97867 x),\sin (11.0855 x),\sin (14.2074 x),\sin (17.3364 x)\} \]