JEE MATHEMATICS MCQ: FUNCTIONS

1 Easy

1 of 1

Application +4 | -1

The range of '

\mathrm{a}

' for which

f(x)=a x+\cos x

is one-one is:

View answer and explanation

Correct option: B

(-\infty,-1] \cup[1, \infty)

Option B (

(-\infty,-1] \cup[1, \infty)

) is correct because the function is one-to-one when its derivative is either always non-negative or always non-positive.

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