# Question:Error, (in DEtools/convertsys) unable to convert to an explicit first-order system

## Question:Error, (in DEtools/convertsys) unable to convert to an explicit first-order system

Maple

Hello i want to solve the differentiel equation but i have these problem i don't understund  why !?

 > restart:with(plots):
 > mb:=765 : mp:=587 :Ib:=76.3*10^3 :Ip:=7.3*10^3 :l:=0.92 :d:=10:F:=0.042:omega:=0.56 :
 > eq1:=(mb+mp)*diff(x(t),t\$2)+mp*l*cos(alpha(t))*diff(alpha(t),t\$2)+mp*[l*[diff(alpha(t),t)]^2*sin(alpha(t))]-F*sin(omega*t)=0;
 (1)
 > eq2:=-mp*l*sin(alpha(t))*diff(alpha(t),t\$2)+mp*[l*[diff(alpha(t),t)]^2*cos(alpha(t))]-9.81*(mp+mb)-F*sin(omega*t)=0;
 (2)
 > eq3:=mp*[d+l*cos(alpha(t))]*diff(x(t),t\$2)+[Ip+mp*l^2+mp*d*l*cos(alpha(t))]*diff(alpha(t),t\$2)-mp*sin(alpha(t))*[-l*d*alpha(t)^2]+mp*[l*9.81*sin(alpha(t))]=0;
 (3)
 > eq4:=mp*l*cos(alpha(t))*diff(x(t),t\$2)+(Ip+mp*l^2)*diff(alpha(t),t\$2)-mp*9.81*l*sin(alpha(t))=0;
 (4)
 > CI:= x(0)=0,alpha(0)=0,D(x)(0)=0,D(alpha)(0)=0;
 (5)
 > sys := eq1, eq2, eq3, eq4:
 >
 > solution:=dsolve([sys,CI],numeric);
 Error, (in DEtools/convertsys) unable to convert to an explicit first-order system
 >