1.

The value of b for which the function f(x) = x + cosx + b is strictly decreasing over R is :(a) b < 1(b) No value of b exists(c) b ≤ 1(d) b ≥ 1

Answer»

Option : (b)

f'(x) = 1 − sinx 

⇒ f'(x) > 0 ⍱x ∈ R 

⇒ no value of b exists



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