f:R->R is defined by {:(f(x),=(cos3x-cos...

`f:R->R` is defined by `{:(f(x),=(cos3x-cosx)/(x^2),",","for" x != 0),(,=k, ",","for" x = 0):}`
If f(x) is continuous at x = 0, the value of k is

A

(a) -2

B

(b) -4

C

(c) -6

D

(d) -8

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The correct Answer is:

B

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