What is the amplitude, period, and phase shift of f(x) = -3 cos(4x + π) + 6?

The amplitudes of those functions are given by the constant in front of sin or cos! 
For example 

F(x) has an amplitude of 2 
G(x) has an amplitude of 1/2 

Now for the period the formula is 2pi/constant next of x 

So for first equation period is 2pi/pi = 2 
and for second equation period is 2pi/2= pii think so

The period of cos is 2π
so the period of cos(4x + π) is 2π/4 = π/2
cos(4x + π) = -cos4x => -3 cos(4x + π) + 6 = 3cos4x + 6 
phase shift may be [-π/4,π/4]
sorry, I forgot: amplitudee  is [-3,3]


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