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JEE Main & Advanced Mathematics Functions Question Bank Functions

  • question_answer
    The range of \[f(x)=\cos (x/3)\] is [RPET 2002]

    A)                    \[(-1/3,\ 1/3)\]

    B)             \[[-1,\ 1]\]

    C)            \[(1/3,\ -1/3)\]

    D)            \[(-3,\ 3)\]

    Correct Answer: B

    Solution :

               \[f(x)=\cos (x/3)\]                    We know that \[-1\le \cos (x/3)\le 1\].


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