Q. 125.0( 1 Vote )

Mark the correct A.

B.

C. λ < 2

D. λ > 2

Answer :

Formula:- (i) The necessary and sufficient condition for differentiable function defined on (a,b) to be strictly decreasing on (a,b) is that f’(x)<0 for all x(a,b)


Given:-


f(x) = cosx – 2λ x


=-sinx-2λ =f’(x)


for decreasing function f’(x)<0


-sinx-2λ <0


Sinx+2λ >0


2λ>-sinx


2λ>1


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