Asked by Josh
                how do i find the amplitude, period, phase shift of y=2 cos(-4t-(-4 pi/3))
            
            
        Answers
                    Answered by
            drwls
            
    The amplitude is the number "2" in front of the trig function.
The frequency (f) is obtained by setting the number "4" in front of "t" equal to 2 pi f. Then solve for f. You can ignore the minus sign.
The phase shift is the 4pi/3 in the inner arentheses. It would be negative if there were a + in front of t, but in this case it is positive.
    
The frequency (f) is obtained by setting the number "4" in front of "t" equal to 2 pi f. Then solve for f. You can ignore the minus sign.
The phase shift is the 4pi/3 in the inner arentheses. It would be negative if there were a + in front of t, but in this case it is positive.
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