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Let f: R->R be a function such that f(x...

Let `f: R->R` be a function such that `f(x)=a x+3sinx+4cosxdot` Then `f(x)` is invertible if (a)`a in (-5,5)` (b) `a in (-oo,5)` (c)`a in (-5,+oo)` (d) none of these

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