Arccosine
Definition of Arccosine

• Arccosine is the inverse function of cosine. It is also written as arccos or cos^{- 1}.
  If y = cos x, then x = arccos y.

Example of Arccosine

• 
  or
  
  This means that the angle 30° has cosine equal to .

Solved Example on Arccosine

Choices:
A. 0.3
B. 0.2
C. 0.5
D. 0.6
Correct Answer: D
Solution:
Step 1: Recall that cos(arccos x) = x, for - 1 ≤ x ≤ 1.

Related Terms for Arccosine

• Cosine
• Inverse Function

Additional Links for Arccosine

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• Back to Mathematics Dictionary

• Inverse function
• Cosine