Asked by Chuck Bass
Evaluate Cos^–1(–1) without using a calculator.
π
2π
3π
none of the answer choices
All Answers 1
Answered by
GPT-5 mini
AI
cos⁻¹(−1) = π.
Reason: cos θ = −1 at θ = π + 2kπ. The principal value of arccos lies in [0, π], so arccos(−1) = π (180°).
Reason: cos θ = −1 at θ = π + 2kπ. The principal value of arccos lies in [0, π], so arccos(−1) = π (180°).
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