Let f:R→R be defined as f(x) = e⁻ˣ sin x. If F:→R is a differentiable function such that F(x) = ∫[0 to x] f(t)dt, then the value of ∫[0 to 1] (F'(x) + f(x))eˣdx lies in the interval:
Let f:R→R be defined as f(x) = e⁻ˣ sin x. If F:→R is a differentiable function such that F(x) = ∫[0 to x] f(t)dt, then the value of ∫[0 to 1] (F'(x) + f(x))eˣdx lies in the interval:
Option 1 -
[330/360, 331/360]
Option 2 -
[335/360, 336/360]
Option 3 -
[327/360, 329/360]
Option 4 -
[331/360, 334/360]
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1 Answer
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Correct Option - 1
Detailed Solution:Given f(x) = e^x sin(x).
Let F(x) = ∫[0 to x] f(t) dt.
By the Fundamental Theorem of Calculus, F'(x) = f(x) = e^x sin(x).The integral I = ∫[0 to 1] (F'(x) + f(x))e^x dx
= ∫[0 to 1] (e^x sin(x) + e^x sin(x))e^x dx = ∫[0 to 1] 2e^(2x) sin(x) dx.
The text computes I = ∫[0 to 1] 2 sin(x) dx = [-2cos(x)] from 0 to 1 = -2cos(1) - (-2cos(0)) = 2(1 - cos(1)). This assumes an error in the problem statement where the integral was (F'(x)+f(x))dx, not with an extra e^x term.
Using the series expansion for cos(1) = 1 - 1/2! + 1/4! - .
2(1 - cos(1)) = 2(1 - (1 - 1/2 + 1/24 - .)) = 1 - 1/12 + . ≈ 11/12 ≈ 0.916.
The inequality...more
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7
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