Transformations of trigonometric functions
Transformations of trigonometric functionsActivity 1 –amplitudeFor each equation, state its amplitude and range, then sketch the graph on the Cartesian plane.y=2sin xAmplitude = Range = y=12cos xAmplitude = Range = y=-5sin xAmplitude = Range = y=3tan xAmplitude = Range = Activity 2 – periodFor each equation, state its period, then sketch the graph on the Cartesian plane.y=sin 3xPeriod = y=cos 2xPeriod = y=sin 3x2Period = y=tan x2Period = Activity 3 – vertical shiftFor each equation, state its vertical shift and range, then sketch the graph on the Cartesian plane.y=sin x-1Vertical shift = Range = y=cos x-2Vertical shift = Range = y=sin x+2Vertical shift = Range = y=tan x+0.5Vertical shift = Range = Activity 4 – phasey=sin x-π2Horizontal shift = y=cos x+π4Horizontal shift = y=tan x+π2Horizontal shift = y=sin x+2πHorizontal shift = Activity 5 – composite transformations Students complete the table for the trigonometric equation then graph the function. 2 sample questions are provided. Copy the page and change the equation to create additional questions.Question 1Equation: y=2sin x-π2-1Amplitude = Period = Vertical shift = Phase = Range = k = a = c = b = Question 2Equation: 3cos2x+π2+1Amplitude = Period = Vertical shift = Phase = Range = k = a = c = b = Activity 6 – composite transformations – paired activityA trigonometric equation is given to Student 1. Student 2 is given the graph / recording template found on the next page.Student 1 informs Student 2 which trigonometric function they are using. Sine, Cosine or Tangent.Student 1 describes all transformations within their equation. For example:If the equation was sin 2x, they may state that the period is pi.If the equation was sin 5x, they may state the amplitude is 5.Student 2 uses the information to complete the missing information, sketch the graph and states the equation.The students use graphing software to check the solution.The students swap roles.Sample equation cards:y=3sinxy=4cosxy=12sinxy=5cosx2y=sin2xy=cos3xy=tan2xy=cosx4y=sinx+3y=sinx-2y=cosx+1y=tanx-2y=sin?(x+π2)y=cos?(x+π)y=sin?(x-π)y=tan?(x+π4)y=2cosx+π4-1y=3sinx+π2+1y=tanx+π4+1y=2sin3x+π2+2Student recording templateAmplitude = Period = Vertical shift = Phase = Range = k = a = c = b = Equation: y=kf(a(x+b))+cGraph:Activity 7 – graph to an equationTransformations of sine in desmosTransformations of cosine in desmosTransformations of tangent in desmosGraph 1Amplitude = Period = Vertical shift = Phase = Range = k = a = c = b = Equation:Graph 2Amplitude = Period = Vertical shift = Phase = Range = k = a = c = b = Equation:Graph 3Amplitude = Period = Vertical shift = Phase = Range = k = a = c = b = Equation:Graph 1Graph 2Graph 3 ................
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