The range of ' \( a \) ' for which \( f(\mathrm{x})=a \mathrm{ax}+\...

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The range of ' \( a \) ' for which \( f(\mathrm{x})=a \mathrm{ax}+\cos \mathrm{x} \) is one-one, is :
\( \mathrm{P} \)
(A) \( \quad(-\infty,-1) \cup(1, \infty) \)
(B) \( \quad(-\infty,-1] \cup[1, \infty) \)
W
(C) \( (-\infty,-1) \)
(D) \( (1, \infty) \)
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