User:Marstr2

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$\left( a-b \right) \cdot \left( a-b \right) = a \cdot a + a \cdot \left( -b \right) + \left( -b \right) \cdot a + \left( -b \right) \cdot \left( -b \right) = a^2-2ab+b^2$
$c 2 = 2 a b + a 2 - 2 a b + b 2 = a 2 + b 2$ Q.E.D
$\vec m = \left[1,0\right]$
$\vec p = \left[-0.52,-0.72\right]$
$\vec j = \left[-0.56,0.72\right]$

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