Remove extraneous cache = FALSE

model-basics.Rmd

@@ -555,7 +555,7 @@ model_matrix(df, y ~ poly(x, 2))
 
 However there's one major problem with using `poly()`: outside the range of the data, polynomials rapidly shoot off to positive or negative infinity. One safer alternative is to use the natural spline, `splines::ns()`.
 
-```{r, cache = FALSE}
+```{r}
 library(splines)
 model_matrix(df, y ~ ns(x, 2))
 ```