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JEE Mains · Maths · STD 12 - 7.2 definite integral

\(x \in R , x \neq 0\), के लिए, यदि \(y(x)\) एक ऐसा अवकलनीय फलन है कि \(x \int \limits_{1}^{x} y(t) d t=(x+1) \int \limits_{1}^{x} t y(t) d t\) है, तो \(y(x)\) बराबर है (जहाँ \(C\) एक अचर है।)

  1. A \(c{x^3}{e^{\frac{1}{x}}}\)
  2. B \(\frac{c}{{{x^2}}}{e^{ - \frac{1}{x}}}\)
  3. C \(\frac{c}{{{x}}}{e^{ - \frac{1}{x}}}\)
  4. D \(\frac{{c{e^{ - \frac{1}{x}}}}}{{{x^3}}}\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(\frac{{c{e^{ - \frac{1}{x}}}}}{{{x^3}}}\)

Step-by-step Solution

Detailed explanation

\(x\int\limits_1^x {y(t)dt = x\int\limits_1^x {ty(t)dt + \int\limits_1^x {ty(t)dt} } } \) Differentiate \(w r:\) to \(x\) \(\int\limits_1^x {y(t)dt + x[y(x) - y(1)]} \) \( = \int\limits_1^x {ty(t)dt + x[xy(x) - y(1)] + xy(x) - y(1)} \)…
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