Question

How do you use transformation to graph the cosine function and determine the amplitude and period of `y=cos(-4x)`?

Answer 1

Amp is 1
Period is `-pi/2`

Explanation:

`Acos(B(x-C)+D`

A is the amplitude
period is `(2pi)/B`
C is the vertical translation
D is the horizontal translation

So amp in this case is 1

Period is `(2pi)/-4=-(pi)/2`