Find the Exact Value cos(1/5)

Problem

cos(1/5)

Solution

1. Identify the expression as the cosine of a real number (1/5 radians).

2. Determine if the value can be expressed using standard algebraic constants or radicals. Since 1/5 is not a standard multiple of π (like π/6 or π/4, there is no simpler exact radical form for cos(1/5)

3. Conclude that the expression is already in its simplest exact form.

Final Answer

cos(1/5)=cos(1/5)

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