Find the Exact Value cos(4/5)

Problem

cos(4/5)

Solution

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

2. Determine if the value 4/5 corresponds to a standard angle on the unit circle (such as 0 π/6 π/4 π/3 or π/2.

3. Conclude that since 4/5 is not a standard angle and no further context (such as a trigonometric identity or an inverse function) is provided, the exact value is simply the expression itself.

Final Answer

cos(4/5)=cos(4/5)

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