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Match each sum or difference formula to its result

Exercise and reference answers

Matching pairs
  1. Left
    cos(x + y)
    Right
    cos x cos y − sin x sin y
  2. Left
    cos(x − y)
    Right
    cos x cos y + sin x sin y
  3. Left
    sin(x + y)
    Right
    sin x cos y + cos x sin y
  4. Left
    sin(x − y)
    Right
    sin x cos y − cos x sin y

Explanation

The four sum and difference formulae. Source: syllabus Maths, Ch 3 Trigonometric Functions.
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