Let f be the function:
F(x)
1/4 x=o,
x 0
3/4 x=1
Using standard partition Pn (0,1) where n greater or equal to 4
L(f, Pn) = 2n(squared) -3n+4 all divided by 4n(squared)
U(f,Pn) = 2n(squared) +3n+4 all divided by 4n(squared)
and deduce that f is intergrable on (0,1) and evaluate (intergral sign with 1 at top and 0 at bottom) of f