Question

What is the amplitude, period and the phase shift of `y=cos2x`?

Answer 1

Amplitude is 1
Period is halved and is now `pi`
No phase shift has happened

Explanation:

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

A~Vertical stretch (Amplitude)
B~Horizontal stretch (period)
C~Horizontal translation (phase shift)
D~Vertical translation

So the A is 1 which means the amplitude is 1
So the B is 2 which means the period is halved so it is `pi`
So the C is 0 which means it hasn't been phase shifted
So the D is 0 which means it hasn't been upwards