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y=x*xa=(y<<1)+9b=(y<<2)+y+9return a*x/bmultiply : 2Divide : 1add : 3sub : 0shift : 3

/ (9x+3x^3)/(9+6x^2) [if x <= 1]\ pi/2 - (9x+3a^3)/(9+6a^2) (where a = 1/x) [otherwise]