Mathematicsif y=cos2⁡3×2−sin2⁡3×2, then d2ydx2 is

if y=cos23x2sin23x2, then d2ydx2 is

  1. A

    31y2

  2. B

    9y

  3. C

    -9y

  4. D

    31y2

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    Solution:

    Given y=cos23x2sin23x2 
    y=cos3xdydx=3sin3x
    and d2ydx2=3×3cos3x=9cos3x=9y

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