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Write the set of values of a for which f...

Write the set of values of `a` for which `f(x)=cosx+a^2\ x+b` is strictly increasing on `R` .

A

`a in [-1,1]`

B

`a in (-oo,-1] cup [1,oo)`

C

`a in (-oo, -1)`

D

` a in p1,oo)`

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The correct Answer is:
B
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