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The equation x + cos x = a has exactly o...

The equation `x + cos x = a` has exactly one positive root. Complete set of values of `'a'` is

A

`a in (0,1)`

B

`a in (2,3)`

C

`a in (1,oo)`

D

`a in (-oo,1)`

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The correct Answer is:
B, C
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