The couple $M=59$kip.in$.$ is applied to a beam of the cross section shown in a plane forming an angle $$ with the vertical. Determine the stress at points $A,B,$ and $D.$

$\backslash$table$[[$The stress at point $A$ is$,$ksi.$],[$The stress at point $B$ is$,$ksi.$],[$The stress at point $D$ is$,$ksi.$]]$