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Which formula does this belong to?

Exercise and reference answers

Items
  1. Item
    cos x cos y − sin x sin y
    Category
    A cosine expansion
  2. Item
    cos x cos y + sin x sin y
    Category
    A cosine expansion
  3. Item
    sin x cos y + cos x sin y
    Category
    A sine expansion
  4. Item
    sin x cos y − cos x sin y
    Category
    A sine expansion
Categories
  1. Item
    A cosine expansion
  2. Item
    A sine expansion

Explanation

Cosine expansions carry the opposite sign to sine expansions. Source: syllabus Maths, Ch 3 Trigonometric Functions.
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