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Mathinline
bodyx = \left[_{\dot{\theta}}^{\theta}\right]
.

We need to find matrices 

Mathinline
bodyA
 and 
Mathinline
bodyB
 such that

Mathinline
body\left[_\ddot{\theta}^\dot{\theta}\right] = A\left[_\dot{\theta}^\theta\right] + Bu(t)