Simplify cos(40)

Problem

cos(40)

Solution

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

2. Determine if the angle is a standard reference angle (like 0 30 45 60 or 90.

3. Conclude that since 40 is not a standard reference angle, the expression cos(40) is already in its simplest exact trigonometric form.

Final Answer

cos(40)=cos(40)

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