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$z = $x x $y / ($x . $y)
$z = $x->cross($y)->divide_by($x->dot($y));
Once (shame on you!)
Twice (shame on me!)
More often than I'd like to be
All the time
Just when answering stupid polls
Who you callin' a fool?
I refuse to vote in this ridiculous poll
Results (534 votes). Check out past polls.