Q. 75

Mark (√) against A. k < 1

B. k ≤ 1

C. k > 1

D. k ≤ 1

Answer :

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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