Evaluate cos(-60 degrees )

Problem

cos(−60^∘)

Solution

1. Apply the even-odd identity for the cosine function, which states that cos(−θ)=cos(θ)

cos(−60^∘)=cos(60^∘)

2. Identify the value of cos(60^∘) using the unit circle or a standard 30^∘−60^∘−90^∘ reference triangle.

cos(60^∘)=1/2

Final Answer

cos(−60^∘)=1/2

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