Dear all,

I already calculate the differential below.. and i want to check it whether the answer that I got is correct or not.

X= [ x xdot psi psidot y ydot z zdot]

solve d/dX (m1/m2*psidot/cos^2 psi )

= [0 0 (2*m1/m2*sec^2 psi *tan psi* psidot) (m1/m2*sec^2 psi) 0 0 0 0]

= (m1/m2)*sec^2 psi [ 0 0 (2 *tan psi* psidot) 1 0 0 0 0]

Thank you very much.