Question

Using trigonometric tables, find the approximate value of cos 43°.

Answer 1

Given: Using trigonometric tables to find cos 43°.

Step-wise calculation:

1. Open the cosine (natural) trigonometric table and locate the row for 43° (i.e., 43° 0′).

2. Read the table value for cos 43° (no minute interpolation is needed since the angle is exactly 43°). The table gives cos 43° = 0.7314.

cos 43° ≈ 0.7314 to four decimal places.