1 | initial version |

You can do something like this:

```
sage: P = plot(cos(x), (x,-2*pi, 2*pi), legend_label='cos(x)')+plot(cos(3*x), (x,-2*pi, 2*pi), color='green', legend_label='cos(3x)')
sage: P.ymin(-1.5)
```

Then evaluating `P`

will yield this picture:

Is this the sort of thing you want? Note that you could also include `ymin=-1.5`

in the command defining the plot:

```
sage: plot(cos(x), (x,-2*pi, 2*pi), legend_label='cos(x)')+plot(cos(3*x), (x,-2*pi, 2*pi), color='green', legend_label='cos(3x)', ymin=-1.6)
```

2 | fix typo in last line |

You can do something like this:

```
sage: P = plot(cos(x), (x,-2*pi, 2*pi), legend_label='cos(x)')+plot(cos(3*x), (x,-2*pi, 2*pi), color='green', legend_label='cos(3x)')
sage: P.ymin(-1.5)
```

Then evaluating `P`

will yield this picture:

Is this the sort of thing you want? Note that you could also include `ymin=-1.5`

in the command defining the plot:

`sage: plot(cos(x), (x,-2*pi, 2*pi), legend_label='cos(x)')+plot(cos(3*x), (x,-2*pi, 2*pi), color='green', legend_label='cos(3x)', `~~ymin=-1.6)
~~ymin=-1.5)

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