Spot the one that does not belong

Exercise and reference answers

Questions

1. Items

   1. sin⁻¹ x
   2. cos⁻¹ x
   3. tan⁻¹ x

   Odd item

   tan⁻¹ x

2. Items

   1. sec⁻¹ x
   2. tan⁻¹ x
   3. cot⁻¹ x

   Odd item

   sec⁻¹ x

3. Items

   1. [−π/2, π/2]
   2. [0, π]
   3. (−π/2, π/2)

   Odd item

   [0, π]

4. Items

   1. cosec⁻¹ x
   2. sec⁻¹ x
   3. cos⁻¹ x

   Odd item

   cos⁻¹ x

5. Items

   1. (0, π)
   2. [−1, 1]
   3. R − (−1, 1)

   Odd item

   (0, π)

Explanation