Find the Exact Value cos(2/5)

Problem

cos(2/5)

Solution

1. Identify the expression as the cosine of a constant value given in radians.

2. Determine if the value corresponds to a standard angle on the unit circle. The value 2/5 is approximately 0.4 radians, which is not a standard multiple of π (such as π/6 π/4 or π/3.

3. Conclude that since the input is not a standard trigonometric angle and no further algebraic context is provided, the exact value is represented by the expression itself.

Final Answer

cos(2/5)=cos(2/5)

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