Evaluate cos(20)

Problem

cos(20)

Solution

1. Identify the task as evaluating the cosine of an angle. Since the angle is given as 20 without a radian symbol or π it is typically interpreted in degrees in a standard geometry context, or as 20 radians in a calculus context. Assuming degrees for a standard trigonometric evaluation.

2. Determine if the angle is a standard value on the unit circle. The angle 20 is not one of the common angles like 0 30 45 60 or 90

3. Use a calculator or trigonometric table to find the decimal approximation.

4. Calculate the value.

Final Answer

cos(20)≈0.9397

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