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If f:R->R where f(x) = ax + cosx is an...

If `f:R->R` where `f(x) = ax + cosx` is an invertible function, then `(a).(-2, -1]uu [1,2)`; `(b).[-1,1]`; `(c).(-oo, -1]uu [1,oo)`; `(d).(-oo, -2]uu [2,oo)`.

A

`(-2, -1]uu [1,2)`

B

`[-1,1]`

C

`(-oo, -1]uu [1,oo)`

D

`(-oo, -2]uu [2,oo)`

Text Solution

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The correct Answer is:
C
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VIKAS GUPTA (BLACK BOOK) ENGLISH-FUNCTION -SUBJECTIVE TYPE PROBLEMS
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