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If f : R to R is defined by f(x) = {...

If f : `R to R ` is defined by
`f(x) = {:{ ((cos 3x - cos x)/(x^(2) ), " for " x ne 0), (lamda , " for " x =0):}`
and if f is continuous at x =0 , then ` lamda ` is equal to

A

`-2`

B

`-4`

C

`-6`

D

`-8`

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Verified by Experts

The correct Answer is:
B
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