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When you click the Knit button a document will be generated that includes both content as well as the output of any embedded R code chunks within the document. You can embed an R code chunk like this:

library(tidyverse)
iris %>% ggplot(aes(Sepal.Length, Sepal.Width, colour = Species)) + 
  geom_point(show.legend = FALSE) + 
  geom_smooth(method = "lm", show.legend = FALSE) +
  theme_bw() + 
  labs(x = "????y l?? tr???c X", 
       y = "????y l?? tr???c Y",
       title = "M???i  li??n h??? gi???a X v?? Y")