OG-11-DS-154

Test Magic :
Is x negative?

1) x^3(1-x^2) < 0                 
   x^3 < 0 &  (1-x^2) > 0   OR   x^3 > 0 & (1-x^2) < 0
   x < 0   &   x^2 < 1      OR   x > 0   & x^2 < 1 
  
2) x^2 - 1 < 0
   x^2 < 1


1+2
  x^2 < 1
  ==> x < 0