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**Homework Statement**

http://img199.imageshack.us/img199/9336/matho.jpg [Broken]

**The attempt at a solution**

I don't really know how to go about solving this problem, since it's a partitioned matrix. If I write it out in its complete 4 * 4 form, it will take a long time to reduce it, and I won't be able to get an answer in the form required by the question. So what method of inverse should I use?

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