2018 · Question 8
Wave-function form · Stationary points and optimisation
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Question-type rarity
CommonWave-function form
Found in 5 of 5 exam years · 5 indexed questions. Rarer does not mean harder.
- 20221 matching questions
- 20231 matching questions
- 20241 matching questions
- 20251 matching questions
- 20261 matching questions
How this rating is calculated
We count the exam years containing this skill heading in the same subject and qualification, across the latest five available sittings (2022–2026). Several matching questions in one year still count as one year. This is a question-type match, not a claim that identical wording repeats.
- Common
- 5/5 years
- Uncommon
- 4/5 years
- Rare
- 3/5 years
- Epic
- 2/5 years
- Legendary
- 1/5 years
- Mythic
- 0/5 years
Automatic topic matching is provisional and can miss or misclassify questions. A question with several skills uses its first indexed skill for this meter. A question without a classification is not rated. A source gap is unknown, not a zero. Mythic means no indexed match in a complete five-year source window; it does not mean impossible. This is historical evidence, not an exam prediction or a reason to skip a topic. Index checked 2026-10-23.
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Original wording · Question 8
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Marking & methods.
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Published marking instructions and accepted methods
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Question-table match starts at viewer page 17. Check the label and read any continuation pages.
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Wave-function form
Combine sine and cosine terms into a single wave expression.
Stationary points and optimisation
Find critical values and justify their nature or practical relevance.
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