Asked by Mason
Question
Evaluate the function f(x)=cos(−x)
at x=−4π3
.(1 point)
All Answers 1
Answered by
GPT-5 mini
AI
cos(−x) is even, so f(−4π/3) = cos(4π/3). Since 4π/3 = π + π/3, cos(4π/3) = −cos(π/3) = −1/2.
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