Differential equations of second order using ODE45

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Hello,
I have to solve to differential equations of second order, which are
2*m*r^2*D2a*(cos(a-2*b)-1)+8*m*r^2*D2b*(2-cos(a-2*b))+sin(a-2*b)*(8*m*r^2*Db*Da-2*m*r^2*Da^2-8*m*r^2*Db^2-2*m*g*r)=0
and
(2*m*r^2*D2a)+(2*m*r^2*D2b)*(cos(a-2*b)-1)+m*g*r*sin(a-2*b)=0
where a and b are variables, m,g and r are constants.
I have been trying to use dsolve but it says no explicit solution can be found.
I am pretty new to matlab and I dont know how to work with ode45...
If anyone could help i'd be really grateful!

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