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JEE Mains · Maths · STD 12 - 9. differential equations

मान लीजिए कि \(y=y(x)\) अवकल समीकरण \(\frac{d y}{d x}+2 y \sec ^2 x=2 \sec ^2 x+3 \tan x \cdot \sec ^2 x\) का हल है जहाँ \(\mathrm{y}(0)=\frac{5}{4}\) है। तो \(12\left(\mathrm{y}\left(\frac{\pi}{4}\right)-\mathrm{e}^{-2}\right)\) का मान = ___ है।

  1. A 20
  2. B 21
  3. C 22
  4. D 23
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Answer & Solution

Correct Answer

(B) 21

Step-by-step Solution

Detailed explanation

\(\text {I.F. } =\mathrm{e}^{\int 2 \sec ^2 x d x} \) \( =\mathrm{e}^{2 \tan x}\) Solution of diff. eq. \(y \cdot e^{2 \tan x}=\int e^{2 \tan x}\left(2 \sec ^2 x+3 \tan x \cdot \sec ^2 x\right) d x \)…
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