Evaluate cos(40)

Problem

cos(40^∘)

Solution

1. Identify the task as evaluating the cosine of an angle measured in degrees.

2. Determine the value using a calculator or trigonometric tables, as 40^∘ is not a standard reference angle (like 30^∘ 45^∘ or 60^∘.

3. Approximate the result to four decimal places.

Final Answer

cos(40^∘)≈0.7660

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