f <- function(x = 3, a = 1, b = 2, c = 3){
y = a*x^2 + b*x + c
plot(x,y)
return(y)
}
g <- function(x = NULL){
y = exp(x)
plot(x,y)
return(y)
}
h <- function(x = NULL){
y = log(x)
plot(x,y)
return(y)
}
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