Question

How do you graph `-3 cos x`?

Answer 1

First graph `y=cos x`

graph{cos x [-10, 10, -5, 5]}

then apply the transformation by multiplying the `y` values by `-3`. This should vertically stretch the graph by a factor of `3`, and reflect the values across the `x` axis as well.

This should be the resulting graph:

graph{-3cos x [-10, 10, -5, 5]}