- Indefinite integral of f(x)=1/(x^2-4x+13)?

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What two variables are needed to describe a normal curve? (Statistics)? Find the indicated limit, if it exists.
lim f(x), x approaches 0
{10x+2 , x < 0}
{ |2-x| , x>10}? Can anybody tell me what's the Chaos Theory math equation? How many peaoyen in au? Find the indicated limit, if it exists. lim f(x), x approaches 9 {x+9 , x < 9} { 27-x , x>9}?