O-LevelAdditional MathematicsTrigonometry4037/12 · Oct/Nov 2019 · Q15 Marks
(i) On the axes below, sketch the graph of y = 2cos3x-1 for -90° ≤x≤ 90°. [Figure 1.1]
- (i)On the axes below, sketch the graph of y = 2cos3x-1 for -90° ≤x≤ 90°.[3]
- (ii)Write down the amplitude of 2cos3x-1.[1]
- (iii)Write down the period of 2cos3x-1.[1]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2019). The mark or mark type is shown in brackets.
- [3] B1 for y intercept (0,1), must have a graph
- [3] B1 for starting and finishing at (+90,-1)
- [3] B1 for all correct, must be attempt at a curve passing through (±30,-1) and (±60,-3)
- [1] B1
- [1] B1
Write your answer and get it marked
On Oracle Prep you can write or photograph your own answer and have it marked by AI against this mark scheme, with feedback on what you missed.
Sign up free →