改了之后出错了.....S=dsolve('Dw=0.2/(w^2*cos(85/180*pi-w*t)-sin(85/180*pi-w*t))','w=0')???Errorusing==>dsolve>mupadDsolveat215UnabletosolveODE:Numberofequationsdiffersfromnumberoffunctions[ode::makeComponents]Errorin==>dsolveat114[R,var_list,order]=mupadDsolve(ignoreConstraints,varargin{1:narg});
symt;w=0;S=dsolve('Dw=0.2/(w^2*cos(85/180*pi-w*t)-sin(85/180*pi-w*t))','t');但是会出现Warning:Explicitsolutioncouldnotbefound.也就是没解。