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JEE Advanced 2015Paper 2
Exam
JEE Advanced
Year
2015
Paper
Paper 2
Subject
Mathematics
Chapter
Definite Integration

JEE Advanced 2015 · Paper 2 · Mathematics · Definite Integration

Let f ^ ′ (x) = 192 x ^ 3 2 + ^ 4 for all x ∈ ℝ with f((1)/(2)) = 0...

Let f′(x)=192x32+sin⁡4\pix{f}^{′}\left(x\right) = \dfrac{192{x}^{3}}{2 + \sin^{4} \pix} for all x∈Rx \in \mathbb{R} with f(12)=0.f\left(\dfrac{1}{2}\right) = 0 . If m≤∫121f(x)dx≤M,m \le \mathop{∫}_{\dfrac{1}{2}}^{1}f\left(x\right)dx \le M, then the possible values of m and M areLet f ^ ′ (x) = 192 x ^ 3 2 + ^ 4 for all x ∈ ℝ with f((1)/(2)) = 0 . If m ≤ ∫ _ (1)/(2) ^ 1 f(x)dx ≤ M, then the

Options

  1. Am=13,M=24m = 13, M = 24
  2. Bm=14,M=12m = \dfrac{1}{4}, M = \dfrac{1}{2}
  3. Cm=−11,M=0m = - 11, M = 0
  4. Dm=1,M=12m = 1, M = 12

Correct answer

D. m=1,M=12m = 1, M = 12

Step-by-step solution

Assuming f(x)f ( x ) to more increasing or less increasing
192x33<f′(x)<192x32\dfrac{192{x}^{3}}{3} < {f}^{′}\left(x\right) < \dfrac{192{x}^{3}}{2}
64x3<f′(x)<96x364{x}^{3} < {f}^{′}\left(x\right) < 96{x}^{3}
∫64x3dx<∫f′(x)dx<∫96x3dx∫ 64{x}^{3}dx < ∫ {f}^{′}\left(x\right)dx < ∫ 96{x}^{3}dx

Let f ^ ′ (x) = 192 x ^ 3 2 + ^ 4 for all x ∈ ℝ with f((1)/(2)) = 0 . If m ≤ ∫ _ (1)/(2) ^ 1 f(x)dx ≤ M, then the
16x4−1<f(x)<24x4−3216{x}^{4} - 1 < f\left(x\right) < 24{x}^{4} - \dfrac{3}{2}
∫121(16x4−1)dx<∫121f(x)dx<∫121(24x4−32)dx{∫}_{\dfrac{1}{2}}^{1}\left(16{x}^{4} - 1\right)dx < {∫}_{\dfrac{1}{2}}^{1}f\left(x\right)dx < {∫}_{\dfrac{1}{2}}^{1}\left(24{x}^{4} - \dfrac{3}{2}\right)dx
2610<∫121f(x)dx<7820\dfrac{26}{10} < {∫}_{\dfrac{1}{2}}^{1}f\left(x\right)dx < \dfrac{78}{20}
Hence option m=1,M=12m = 1, M = 12 is correct.

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