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If lim(x rarr 0) ((cos 4x + a cos 2x+b)/...

If `lim_(x rarr 0) ((cos 4x + a cos 2x+b)/(x^(4)))` is finite, then the values of a and b are respectively.

A

(5,-4)

B

(-5,-4)

C

(-4,3)

D

4,5

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The correct Answer is:
C
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