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underset(x to 0)"Lt" (cos^(2)x-sin^(2)x-...

`underset(x to 0)"Lt" (cos^(2)x-sin^(2)x-1)/(sqrt(x^(2)+1)-1)=`

A

0

B

`-4`

C

1

D

4

Text Solution

Verified by Experts

The correct Answer is:
B
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