Question

How do you find the amplitude, period and phase shift for `y = cos (x + Pi/4)`?

Answer 1

See the explanation.

Explanation:

General form of cosine: `y=acos(bx+c)`

Amplitude is equal to `a`, so: `A=1`
Period: `T=(2pi)/b=(2pi)/1=2pi`
Phase shift: `c=pi/4`, function is shifted to the left.