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

यदि \(y = y ( x )\), अवकल समीकरण \(\frac{ dy }{ dx }=(\tan x-y) \sec ^{2} x , x \in\left(-\frac{\pi}{2}, \frac{\pi}{2}\right)\) जबकि \(y (0)=0\) का हल है, तो \(y \left(-\frac{\pi}{4}\right)\) बराबर है

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

Answer & Solution

Correct Answer

(C) \(e -2\)

Step-by-step Solution

Detailed explanation

\(\frac{d y}{d x}=(\tan x-y) \sec ^{2} x\) \(\frac{d y}{d x}+y \sec ^{2} x=\tan x \sec ^{2} x\) Let \(\tan x=t \Rightarrow \sec ^{2} x=\frac{d t}{d x}\) \(\therefore \frac{d y}{d t}=(t-y)\) \(\frac{d y}{d t}+y=t\) (Linear differential equation) After solving we get…
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