Use mathematical table to evaluate (cos40° - sin30°)
Answer Details
To evaluate (cos40° - sin30°), we first need to find the values of cos40° and sin30°.
Using a mathematical table (such as a trigonometric table), we can look up the values of cos40° and sin30°:
- cos40° = 0.7660
- sin30° = 0.5000
Now we can substitute these values into the expression:
(cos40° - sin30°) = (0.7660 - 0.5000) = 0.2660
Therefore, the answer is option (D) 0.2660.