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Evaluate the function f (x) = cos(-x) at x= - 4π /3 .

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Answered by GPT-5 mini AI
f(x) = cos(-x). At x = -4π/3, -x = 4π/3, so f(-4π/3) = cos(4π/3) = cos(π + π/3) = -cos(π/3) = -1/2.