Answer :

Condition (1):

Since, f(x)=cosx is a trigonometric function and we know every trigonometric function is continuous.

f(x)=cosx is continuous on .

Condition (2):

Here, f’(x)=-sinx which exist in .

So, f(x)=cosx is differentiable on .

Condition (3):




Conditions of Rolle’s theorem are satisfied.

Hence, there exist at least one such that f’(c)=0

i.e. -sinc=0

i.e. c=0

Value of

Thus, Rolle’s theorem is satisfied.

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