Can someone explain how they got the term with the red box(adsbygoogle = window.adsbygoogle || []).push({});

I understand the kl/2 but not the sin and cos part

**Question** Consider the inverted pedulum connected to two equal springs both with constant k. Springs are undelfected when the mass is in the verticle position. If the rod is of length l and the spring are connected at l/2 find the equation of motion.

http://img442.imageshack.us/img442/4896/24111q.jpg [Broken]

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# Pendulum solution not working

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