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5 January, 05:56

The range of the function y = 2cos x is - 2 ≤ y ≤ 2.

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  1. 5 January, 06:20
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    The range of the function y = 2cos x is - 2
    Step-by-step explanation:

    We know that cos (0) = 1 and cos (π) = - 1 are the two extreme values which cos x assume when x ∈ R and it is also that cos (x) is a continuous periodic function with period 2π when x ∈ R,

    since,

    cos (x + 2π) = cos x

    So, the range of the function y = 2cos x is - 2
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