1-1. -2

1-2. 1/루트e


2-1. {a(b+c)/(a+b+c)}^2

2-2. 루트2

2-3. 5+루트41


3-1. 1-cosa/(1+sina)

3-2. pi{a-1+cosa/(1+sina)}

3-3. pi/4, pi^2/2-pi