#Remember that you need to declare any variables used in functions.
#We declare the variable x since it is the "standard" variable for explicit 2d functions y=f(x) and we will use it.
# the default figsize=8 and is rather large (I get a 4x3 ratio of pixels: 563x431)
# also notice that the aspect_ratio is not 1:1, but is determined by the ranges of values (see way below for more on aspect_ratio)
#You can define the function separately
# To plot more than one function, NAME your plots and then use command show with sum (addition). Notice that the ranges are fixed in the plot commands.