1-1 f(x)=|sinx|/루트2 , 최솟갑 1/루트2
1-2 g(1)= 1/루트2e 최솟값 8

2-1 x^2
2-2 x^3(x^2-1)/6
2-3 1/3 1/3 2

3-1 12x+3a
3-2 3/4, -1/4,-5/4
3-3 (4x+9)(x+1/4)(x+17/4)
(4x+5)(x-3/4)(x+13/4)
(4x+1)(x-7/4)(x+9/4) 나온듯?
쨌든 f(9/4)= f(a/4) , f(a/4+1) , f(a/4+2) 일때 3개 나왔음