Question

Using trigonometric tables, find the approximate value of sec 23° 20'.

Answer 1

Given: `sec 23^circ 20' = 1/(cos 23^circ 20')`

Step-wise calculation:

1. From trigonometric tables, cos 23°20' ≈ 0.91814.

2. Therefore, `sec 23^circ 20' = 1/0.91814`

sec 23°20' ≈ 1.08905 

sec 23°20' ≈ 1.0891