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11 November, 10:45

Find the range of y = 3cos4x - 2.

-5 ≤ y ≤ 5

-5 ≤ y ≤ 1

-3 ≤ y ≤ 3

1 ≤ y ≤ 3

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Answers (1)
  1. 11 November, 11:31
    0
    So,

    -3 ≤ 3cos4x ≤ 3

    Therefore,

    -3 - 2 ≤ 3cos4x - 2 ≤ 3 - 2

    -5 ≤ 3cos4x - 2 ≤ 1

    From which the result follows:

    -5 ≤ y ≤ 1
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