Which of the following is true for f of x is equal to 5 cosine x plus 1 ?

Cosine ranges from −1 to 1, so 5 cos x ranges from −5 to 5. Adding 1 shifts the range to [−4, 6], making choice A true. At x = π/2, f(x) = 1, not 0; the amplitude is 5 and the period is 2π.

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