Find the Exact Value cos(3/5)

Problem

cos(3/5)

Solution

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

2. Determine if the value corresponds to a common angle on the unit circle. The value 3/5 radians (approximately 34.38 is not a standard angle like 0 π/6 π/4 π/3 or π/2

3. Conclude that since 3/5 is not a standard reference angle, the exact value cannot be simplified further into a radical or rational form.

Final Answer

cos(3/5)=cos(3/5)

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