Q75 of 292 Page 569

Mark (√) against the correct answer in the following:

is decreasing for all , when


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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