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The value of ordered pair (a,b) such tha...

The value of ordered pair (a,b) such that `lim _(xto0) (x (1+ a cos x ) -b sin x )/( x ^(3))=1,` is:

A

`(5)//(3) , (3)/(2) `

B

`(5)/(2) ,-(3)/(2) `

C

`- (5)/(2) , -(3)/(2)`

D

None of these

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The correct Answer is:
C
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