Paper 2 · Trigonometry
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Lesson 2 of 6
Trigonometry 3.2: Changing the amplitude
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- Read the amplitude from the coefficient in y = a sin x and set the range [−|a|, |a|]
- Recognise that amplitude changes neither the period (2π) nor the midline (y = 0)
- Reflect the graph in the midline when the coefficient is negative
- Sketch graphs like y = −6 cos x by marking the quarter-period points
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