Q. 2

Mark the correct A. (1, ∞)

B. (–1, ∞)

C. (–∞, ∞)

D. (0, ∞)

Answer :

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


Given:-


f(x) = cos–1 x + x



Now


f(x)>0



xR


x(–∞, ∞)

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