1/9![\left[\begin{array}{ccc}cosx&1&0\\1&2cosx&1\\0&1&2cosx\end{array}\right]](https://tex.z-dn.net/?f=%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7Dcosx%26amp%3B1%26amp%3B0%5C%5C1%26amp%3B2cosx%26amp%3B1%5C%5C0%26amp%3B1%26amp%3B2cosx%5Cend%7Barray%7D%5Cright%5D "\left[\begin{array}{ccc}cosx&1&0\\1&2cosx&1\\0&1&2cosx\end{array}\right]")
=f(x)
d²f/dx²=
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please see the attachment
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