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If underset(x to 0)"Lt" ((cos 4x+a cos ...

If `underset(x to 0)"Lt" ((cos 4x+a cos 2x+b)/(x^(4)))` is finite, then the value of a, b are respectiveluy.

A

5,-4

B

`-5,-4`

C

`-4,3`

D

4,5

Text Solution

Verified by Experts

The correct Answer is:
C
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