u'u''-k1u=-a*cos(hy)-b
where,u'=du/dy;
and and a,b,k1 are constants
conditions
u(-H)=0;
u'(0)=0;
where 2H is height of the channel where the liquid is flowing
please help any suggestions are welcome
i couldn't find the analytical soln
numerical soln also am havin a dead end so please