How do you use transformation to graph the sin function and determine the amplitude and period of y=sin(x+pi/6)y=sin(x+π6)?

1 Answer
Dec 3, 2017

See below.

Explanation:

If we look at a trig function in the form:

y =asin(bx+c)+dy=asin(bx+c)+d

Amplitude is color(white)(888) color(blue)(a)888a

Period is color(white)(888)color(blue)((2pi)/b)8882πb

Phase shift is color(white)(888) color(blue)((-c)/b)888cb

Vertical shift is color(white)(888)color(blue)(d)888d

From: y=sin(x+pi/6)y=sin(x+π6)

We can see amplitude is 1. This is the same as for y=sin(x)y=sin(x)

The period is: (2pi)/1=2pi2π1=2π. This is the same as y=sinxy=sinx

Phase shift is: (-pi/6)/1=-pi/6π61=π6 This translates the graph of

y=sinxy=sinx color(white)(88) pi/688π6 units to the left.

From the above, we conclude that the graph of y=sin(x+pi/6)y=sin(x+π6) is the graph of y=sinxy=sinx translated pi/6π6 units to the left.

Graph of y=sin(x+pi/6)y=sin(x+π6) and y=sinxy=sinx on the same axes:

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