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(a/b) > 0 when
signs of a and b are the same

 a  = b when
a = b or a = b

 a  > b when
a > b or a < b

 a  < b when
b < a < b

 x  can be rewritten as
 ( x , x >= 0 )
 (x , x < 0 )

a^3  b^3 =
( a  b )( a^2 + ab + b^2 )

a^3 + b^3 =
( a + b )(a^2 ab + b^2)

The slopes of 2 parallel lines are
equal

The slopes of 2 normal lines are
negative reciprocals

The equation of a line with slope m passing through (a,b) is
y  b = m( x  a )

