if f:R->R, where f(x)=ax+cosx. If f(x...

if `f:R->R`, where `f(x)=ax+cosx`. If `f(x)` is bijective, then (A) `a in R` (B) `a in R^+` (C) `a in R^-` (D) `a in R-(-1,1)`

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`f(x)=ax+cosx`
`f(-oo)=-oo`
`f(oo)=oo`
`f'(x)=a-sinx>=0`
`a-sinx>=0`
`a>=sinx,a>=1`
`a-sinx<=0`
`a<=sinxa<=-1`
...

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