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f(x) = sin x - kx is decreasing for all x ∉ R, whenA. k < 1B. k ≤ 1C. k > 1D. k ≥ 1 |
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Answer» Answer is : D. k ≥ 1 f(x) = sin x - kx f’(x) = cos x – k ∴ f decreases, if f’(x) ≤ 0 ⇒ cos x – k ≤ 0 ⇒ cos x ≤ k So, for decreasing k ≥ 1. |
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