_a×_a=+2
![- a \times - a = + 2 \\ \\ \\ \\ \\ \\ - a \times - a = + 2 \\ \\ \\ \\ \\ \\](https://tex.z-dn.net/?f=+-+a++%5Ctimes++-+a+%3D++%2B+2+%5C%5C++%5C%5C++%5C%5C++%5C%5C++%5C%5C++%5C%5C+)
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