Q. 174.0( 1 Vote )

# Verify Rolle’s th

Condition (1):

Since, f(x)=e-x sinx is a combination of exponential and trigonometric function which is continuous.

f(x)= e-x sinx is continuous on [0,π].

Condition (2):

Here, f’(x)= e-x (cosx – sinx) which exist in [0,π].

So, f(x)= e-x sinx is differentiable on (0,π)

Condition (3):

Here, f(0)= e-0 sin0=0

And f(π)= esinπ =0

i.e. f(0)=f(π)

Conditions of Rolle’s theorem are satisfied.

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

i.e. e-c (cos c – sin c) =0

i.e. cos c-sin c = 0

i.e. Value of Thus, Rolle’s theorem is satisfied.

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