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Match each identity to its name

Exercise and reference answers

Matching pairs
  1. Left
    cos²x + sin²x
    Right
    = 1
  2. Left
    1 + tan²x
    Right
    = sec²x
  3. Left
    1 + cot²x
    Right
    = cosec²x
  4. Left
    l = rθ
    Right
    arc length from radius and angle

Explanation

The three Pythagorean identities the chapter lists. Source: syllabus Maths, Ch 3 Trigonometric Functions.
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