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Question

If limx0kx cosec x = limx0x cosec kx , then k =


A

1

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B

-1

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C

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D

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Solution

The correct option is C


limx0kx cosec x = limx0 x cosec kx

= k limx0xsinx =1klimx0kxsinkx =k=1k=k=± 1


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