Let PL an QL denote, respectively, projection on and reflection in the line L through the origin with direction vector d = [a b c] =not 0(adsbygoogle = window.adsbygoogle || []).push({});

I got a proplem showing that PL is a matrix.

1/(a^2 +b^2+c^) = Matrix......a^2 ab ac

..........................................ab b^2 bc

..........................................ac bc c^2

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# Show that PL has matrix

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