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Spot the one that does not belong

Exercise and reference answers

Questions
  1. Items
    1. l = rθ
    2. cos²x + sin²x = 1
    3. 1 + tan²x = sec²x
    Odd item
    l = rθ
  2. Items
    1. sin(−x) = −sin x
    2. l = rθ
    3. cos(−x) = cos x
    Odd item
    l = rθ
  3. Items
    1. Radian
    2. Degree
    3. Slope
    Odd item
    Slope

Explanation

Grouped by which summary bullet each comes from. Source: syllabus Maths, Ch 3 Trigonometric Functions.
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