The problem asks to graph the function $y = \cos(x - \frac{\pi}{6})$.

AnalysisTrigonometryCosine FunctionGraphingPhase ShiftAmplitudePeriod
2025/3/16

1. Problem Description

The problem asks to graph the function y=cos(xπ6)y = \cos(x - \frac{\pi}{6}).

2. Solution Steps

The general form of a cosine function is y=Acos(BxC)+Dy = A\cos(Bx - C) + D, where:
AA is the amplitude.
The period is 2πB\frac{2\pi}{|B|}.
The phase shift is CB\frac{C}{B}.
DD is the vertical shift.
In our case, y=cos(xπ6)y = \cos(x - \frac{\pi}{6}). Comparing with the general form, we have:
A=1A = 1
B=1B = 1
C=π6C = \frac{\pi}{6}
D=0D = 0
The amplitude is 11.
The period is 2π1=2π\frac{2\pi}{|1|} = 2\pi.
The phase shift is π61=π6\frac{\frac{\pi}{6}}{1} = \frac{\pi}{6}.
The vertical shift is 00.
The function y=cos(xπ6)y = \cos(x - \frac{\pi}{6}) is a cosine function shifted to the right by π6\frac{\pi}{6}.
The standard cosine function y=cos(x)y = \cos(x) starts at (0,1)(0, 1), reaches (π2,0)( \frac{\pi}{2}, 0), (π,1)(\pi, -1), (3π2,0)(\frac{3\pi}{2}, 0) and ends at (2π,1)(2\pi, 1).
Since the phase shift is π6\frac{\pi}{6}, we shift these points to the right by π6\frac{\pi}{6}.
The key points of the graph are:
(π6,1)(\frac{\pi}{6}, 1)
(π2+π6,0)=(3π6+π6,0)=(4π6,0)=(2π3,0)(\frac{\pi}{2} + \frac{\pi}{6}, 0) = (\frac{3\pi}{6} + \frac{\pi}{6}, 0) = (\frac{4\pi}{6}, 0) = (\frac{2\pi}{3}, 0)
(π+π6,1)=(6π6+π6,1)=(7π6,1)(\pi + \frac{\pi}{6}, -1) = (\frac{6\pi}{6} + \frac{\pi}{6}, -1) = (\frac{7\pi}{6}, -1)
(3π2+π6,0)=(9π6+π6,0)=(10π6,0)=(5π3,0)(\frac{3\pi}{2} + \frac{\pi}{6}, 0) = (\frac{9\pi}{6} + \frac{\pi}{6}, 0) = (\frac{10\pi}{6}, 0) = (\frac{5\pi}{3}, 0)
(2π+π6,1)=(12π6+π6,1)=(13π6,1)(2\pi + \frac{\pi}{6}, 1) = (\frac{12\pi}{6} + \frac{\pi}{6}, 1) = (\frac{13\pi}{6}, 1)

3. Final Answer

The graph of y=cos(xπ6)y = \cos(x - \frac{\pi}{6}) is a cosine curve with amplitude 1, period 2π2\pi, and phase shift π6\frac{\pi}{6} to the right. The key points for one period are (π6,1)(\frac{\pi}{6}, 1), (2π3,0)(\frac{2\pi}{3}, 0), (7π6,1)(\frac{7\pi}{6}, -1), (5π3,0)(\frac{5\pi}{3}, 0), and (13π6,1)(\frac{13\pi}{6}, 1).

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