Study the given table and answer the question that follows.
The following table shows the production of printers by four plants of a company over the five years.
| Year | Production (in thousands) | |||
| Plant 1 | Plant 2 | Plant 3 | Plant 4 | |
| 2018 | 35 | 25 | 40 | 45 |
| 2019 | 43 | 44 | 44 | 40 |
| 2020 | 48 | 39 | 36 | 30 |
| 2021 | 32 | 40 | 35 | 48 |
| 2022 | 42 | 44 | 30 | 42 |
What is the difference between the average production of plant 1 and plant 2 during five years?
Let x = r cos (t), y = r sin (t) cos (u), z = r sin (t)sin (u). Then the value of x2 + y2 + z2 is ___.
Simplify
If tanθ - 3 =0, then the value of \(\dfrac{1 - \cos 2\theta}{1 + \cos 2\theta}\) is: