Paper 2 · Trigonometry
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Lesson 4 of 6
Trigonometry 3.4: Changing the midline
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- Read midline, amplitude and period from the general form y = a + b·trig(ct)
- Write the midline as y = a and the range as [a − |b|, a + |b|]
- Choose 2π/c or 360°/c for the period based on the question's unit system
- Sketch graphs like y = −2 − 3 cos 4πt, letting a negative b flip the shape
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