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Find the maximum and minimum value …

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Find the maximum and minimum value of f(x) = 2cos2x - cos4x where x is from 0 to pi

    • Posted by Vaibhav Kulkarni 5 years ago

    CBSE > Class 12 > Mathematics
    • 1 answers

    Gaurav Seth 5 years ago

    <pre>  </pre>

    2cos2x-cos4x

     

    =2 cos2x -2cos22x +1

     

    =-2(cos2x-1/2)2 +3/2

     

    minimum value occur when cos2x-1/2 will be maximum

     

      =-2(-1-1/2)2 +3/2

     

      =-3
    and minimum value is 3/2

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