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I'm having trouble setting initial conditions when solving differential equations in Maple. Here's the equation:

[tex]\theta(t)''+4\pi^2 sin(\theta(t))=0[/tex], with [tex]\theta(0)=A[/tex] and [tex]\theta'(0)=B[/tex] as initial conditions.

I'd like to solve it with a command like:

solution:=dsolve({diff(theta(t), t, t) + 4*Pi*sin(theta(t)=0, init_conds},theta(t),numeric,range=0..4);

with something like:

init_conds:={theta(0)=A, diff(theta, t)=B);

But it seems Maple doesn't like my way of doing things... I've searched the help file, but couldn't find one that suits my problem.

Anyone? Thank you!!