Finding the solution to system of Differential equations

I am trying to graph the solution to the following system of differential equations and finding the closed form solution using for example.the symbolic toolbox would help me understand what function is being plotted. When using the symbolic toolbox to find the analytical solution Matlab states that it is unable to find an explicit solution. On the other hand when I tried to write a function and graph the solution the graph was not visible. Can someone explain how I can either find the analytical solution or graph the solution? Any help would be appreciated.

t''= t'^2(tan(t)) - x''(4sec(t))

t'^2 (sec(t)-tan(t)) = x''*sec(t)*(1/0.625-4)

Initial conditions: t(0) = pi/3; t 0) = 0; x'(0) = x(0) = 0

[Walter Roberson]

What is your sample code?