Asked by clouds

Use your calculator to find cos−1(0.76) to the nearest degree.

A. 49
B. 47
C. 43
D. 41

thank you if you help. or for even viewing it.
Answered by oobleck
so, did you use your calculator?
It has a "COS" button, and probably a "INV" or "Fn" button.
0.76 INV COS will give you what you need.
Answered by clouds
okay but how do I calculate it with the COS button
Answered by oobleck
you cannot use just the COS button.
Read your calculator guide. You want the inverse cosine, which requires another button.

since cos 40.54° = 0.76
pressing 0.76 INV COS should display 40.5358...
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