यदि [(x + 1)2 f(x) – g(x)] नीचे दिखाए गए अवकल समीकरण का विशेष समाकल है, तो

  1. f(x) = log (x + 1)2 और g(x) = 2x + 5
  2.  और 
  3. f(x) = log (x + 1) और g(x) = 5x + 1
  4.  और  

Answer (Detailed Solution Below)

Option 4 :  और  
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Detailed Solution

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माना x + 1 = ez ताकि z = log (x + 1) और x = ez – 1

दिया गया समीकरण बन जाता है:

[D(D - 1) – 3D + 4]y = (ez - 1)2, d = d/dz

Or (D2 – 4D + 4)y = e2z – 2ez + 1

अतिरिक्त समीकरण, m2 – 4m + 4 = 0 है

(m – 2)2 = 0

∴ 

सही उत्तर है:

 और

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