AQA Further Paper 1 2021 June — Question 3 1 marks

Exam BoardAQA
ModuleFurther Paper 1 (Further Paper 1)
Year2021
SessionJune
Marks1
PaperDownload PDF ↗
Mark schemeDownload PDF ↗
TopicPolar coordinates
TypeShow polar curve has Cartesian form
DifficultyModerate -0.5 This is a straightforward polar-to-Cartesian conversion using standard identities (r²sin2θ = 2rsinθ·rcosθ = 2xy). While it's a Further Maths topic, it requires only direct substitution of known formulas with no problem-solving, making it easier than average but not trivial due to the Further Maths context.
Spec4.09a Polar coordinates: convert to/from cartesian

The curve C has polar equation $$r^2 \sin 2\theta = 4$$ Find a Cartesian equation for C. Circle your answer. [1 mark] \(y = 2x\) \quad \(y = \frac{x}{2}\) \quad \(y = \frac{2}{x}\) \quad \(y = 4x\)

Question 3:
AnswerMarks Guidance
3Circles correct answer 2.2a
Total1 𝑦𝑦 =
𝑥𝑥
AnswerMarks Guidance
QMarking Instructions AO
Question 3:
3 | Circles correct answer | 2.2a | B1 | 2
Total | 1 | 𝑦𝑦 =
𝑥𝑥
Q | Marking Instructions | AO | Marks | Typical solution
The curve C has polar equation
$$r^2 \sin 2\theta = 4$$

Find a Cartesian equation for C.

Circle your answer.
[1 mark]

$y = 2x$ \quad $y = \frac{x}{2}$ \quad $y = \frac{2}{x}$ \quad $y = 4x$

\hfill \mbox{\textit{AQA Further Paper 1 2021 Q3 [1]}}