अवकल समीकरण  का हल ________ होगा, जहाँ c1 और c2 अचर हैं।

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  1. y = c1 + c2 x2
  2. y = c1 cos x + c2 sin x
  3. y = c1 x + c2 x2

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संकल्पना:

सहायक समीकरण के विभिन्न मूलों के लिए अवकल समीकरण का हल (पूरक फलन) नीचे दिखाया गया है।

सहायक समीकरण के मूल

पूरक फलन

m1, m2, m3, … (वास्तविक और भिन्न मूल)

m1, m1, m3, … (दो वास्तविक और समान मूल)

 

m1, m1, m1, m4… (तीन वास्तविक और समान मूल)

α + i β, α – i β, m3, … (काल्पनिक मूलों का एक जोड़ा)

α ± i β, α ± i β, m5, … (समान काल्पनिक मूलों के दो जोड़े)

गणना:

दिया है:

x = eरखने पर 

⇒ t = ln x

अब, उपरोक्त अवकल समीकरण निम्न प्रकार बन जाती है

D(D - 1)y + 4 Dy + 2y = 0 ⇒ (D2 + 3D + 2)y = 0

⇒ D = -1, -2;

अब हल निम्न होगा  y = C1e-t + C2e-2t

x = eके मानों को रखने पर 

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