x is an acute angle. Find the value of x in degrees. Round to the nearest hundredth.
cos(x) = 0.4
Options
A
66.42°
B
62.87°
C
65.84°
D
67.50°
Answer & Analysis
Answer
A
Analysis
Question Analysis
The main focus of this problem is to use the inverse cosine function to find the acute angle given that . Since is acute (<<), we'll work within this range to determine the value of .
Key Concept Explanation
The inverse cosine function, or , gives the angle whose cosine is . That is, if , then . The principal value range of is
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