If y=y(x) is the solution of the differential equation dy dx+ 4x (x^2-1)y= x+2 (x^2-1)^ 5 2,x>1 such that y(2)= 2 9 log_e(2+√3) and y(√2)=α log_e(√α…
JEE Main 2023 — Mathematics Calculus
2023integerhard
If y=y(x) is the solution of the differential equation dxdy+(x2−1)4xy=(x2−1)25x+2,x>1 such that y(2)=92loge(2+3) and y(2)=αloge(α+β)+β−γ,α,β,γ∈N, then αβγ is equal to
Official previous-year question
Held on 13 Apr 2023 · Verified 6 Jul 2026.
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Solution
Given differential equation is dxdy+(x2−1)4xy=(x2−1)25x+2,x>1
Now IF=e∫x2−14xdx=(x2−1)2
The required equation will be ⇒y⋅(x2−1)2=∫(x2−1)1/2x+2dx
⇒y⋅(x2−1)2=21∫(x2−1)1/22xdx+2∫(x2−1)1/2dx
⇒y⋅(x2−1)2=2ln(∣x2−1+x∣)+x2−1+C
Now using, at x=2,y(2)=92loge(2+3) we get,
⇒9⋅92ln(2+3)=2ln(2+3)+3+C
⇒C=−3
Now finding the value of function at x=2 we get,
y×1=2ln(1+2)+1−3
Now on comparing we get,
⇒β=1,α=2,γ=3
⇒αβγ=1×2×3=6
Hence, this is the required answer.
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