Paper 2 · Trigonometry
⏱ Tested in 2 exam questions since 2017
Lesson 5 of 6
Trigonometry 3.5: Identifying functions from their graph
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- Write a graph's equation in the form y = a + b·trig(ct) by decoding four features
- Compute a = (max + min)/2 and |b| = (max − min)/2 from the graph
- Pick sin or cos and the sign of b from the starting position and direction
- Find c = 2π/period, multiplying partial cycles by 2 or 4 to recover the period
Most recent exam questions
- 2023 P2 Q7(f)
- 2017 P1 Q9(b)(i)
- 2017 P1 Q9(b)(ii)
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