{v=root_of(v_**6 + v_ + 1,v_,tag_1),v=1}
{{x= - y,y=root_of(y_**4 + y_ - 1,y_,tag_3)},
{x= - y,y=root_of(y_**3 + y_**2 - 1,y_,tag_2)}}
{{q=myfun1(p^2+1,exp(r)), p=cos(r), r=m_y2f(p,r,s)},{
q=myfun1(p^2+1), p=cos(-r), r=m_y2f(d+e)}}
