Test Post 123

This is my first test postt.

Header with code in it and math a2+b2\sqrt{a^2+b^2}

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katex: c=±a2+b2c = \pm\sqrt{a^2 + b^2}

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Block:

c=±a2+b2+c2+d2c = \pm\sqrt{a^2 + b^2 + c^2 + d^2}

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