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Question

limn 20x=1 cos 2n(x10) is equal to


A

0

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B

1

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C

19

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D

20

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Solution

The correct option is B

1


limn cos 2nx = {1,x=rπ,rI0,xrπ,rI

Here, for x = 10, limncos2n(x10) = 1

and in all other cases it is zero

limn20x=1cos2n(x10) = 1


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