If limx→0 xn−sin⁡xnx−sinn⁡x is nonzero and finite,then n in equal to

If limx0xnsinxnxsinnx is nonzero and finite,
then n in equal to

  1. A

    1

  2. B

    4

  3. C

    2

  4. D

    3

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    Solution:

    limx0xnsinxnxsinnx00

    =limx0nxn11cosxn1nsinn1xcosx (L Hopital Rule)

    =01=0, if n>1

    For n=0,limx0xnsinxnxsinnx=limx01sin1x1=sin11

    For n=1,limx0xnsinxnxsinnx=limx0xsinxxsinx=1

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