x(3);
    -2*sec(x(1))*x(3)*x(4);
    (4*g*sin(x(1)))/(5.*r) + cos(x(1))*sin(x(1))*(x(2)*x(2)) + (6*cos(x(1))*x(2)*x(4))/5.;
    (-5*cos(x(1))*x(2)*x(3))/3. + 2*tan(x(1))*x(3)*x(4);