Question 25
TrigonometryThe graph above is a sketch of
- A.y = sin 2x
- B.y = sin x
- C.y = cos 2x
- D.y = 2sin x
- E.y = 2cos x
Show the answer and explanation
Answer: D (y = 2sin x)
Explanation
The curve starts at 0, crosses the x-axis at π and 2π (period 2π) and reaches −2, so it is a sine curve with amplitude 2: y = 2 sin x.