Question

How do you graph `y=-cosx-1`?

Answer 1

graph{-cosx -1 [-5, 5, -2.5, 2.5]}

Explanation:

It is important to learn what the graphs of `y=sinx` and `y=cosx` look like;

The graph of `y=cosx` is as follows;
graph{cosx [-5, 5, -2.5, 2.5]}

So, the graph of `y=-cosx` is the above graph inverted
graph{-cosx [-5, 5, -2.5, 2.5]}

And, the graph of `y=-cosx-1` is the above graph translated 1 unit down
graph{-cosx -1 [-5, 5, -2.5, 2.5]}