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

If f: R ` to ` R is defined by `f(x) = {:{((2 sin x - sin 2x)/( 2 x cosx) , " if x ne 0), (a, if x ne 0):}`
then the value of 'a' so that f is continuous at 0 is

A

2

B

1

C

`-1`

D

0

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The correct Answer is:
D
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