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f(x) = g(2x - 1) = 1/3 x^2 - A^2x + 2 = 1/3(2x-1)^2-A(2x-1) + 2
f'(x)= 2/3 (2x-1).2 -2A=0
4/3(2.1 - 1) -2A=0
4/3 = 2a
a= 2/3
g(1)=1/3(2x-1)^2-2/3(2x-1) + 2 =0 -2/3 +2 =-2/3 + 6/3 = 4/3