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You need to use the following formula to evaluate the amplitude, period and phase shift of the given function `y =` `-4cos 3x + 4` :

`y = Acos(Bx - C) + D`

A represents the amplitude, hence, `A = 4.`

You may evaluate the period using the formula `T = (2pi)/B` , hence `T = (2pi)/3.`

You may evaluate the phase shift using the formula phase shift `= C/B` . Since `C = 0` ,yields that the phase shift is `C/B = 0` .

Hence, evaluating the amplitude, period and phase shift of the given function yields `A = 4, T = (2pi)/3` , phase shift `C/B = 0.`

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