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Which of these functions are even? A. f(x) = cos (2x B. f(x) = 2 sin(x) cos(x) cos( 2xx c. f(x) = x D. f(x)

Which of these functions are even? A. f(x) = cos (2x B. f(x) = 2 sin(x) cos(x) cos( 2xx c. f(x) = x D. f(x) = csc(x2) DE. f(t) = sec2(t) - 1 F. f(x) = sin(2x)

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