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QJEEM24Maf65e: JEE Main 2024 Mathematics - Class 12 JEEM24Maf65e Solution: If the solution curve, of the differential equation passing…

If the solution curve, of the differential equation dy dx=x+y−2x−y\frac{\mathrm{d} y}{\mathrm{~d} x}=\frac{x+y-2}{x-y} passing through the point (2,1)(2,1) is tan⁡−1(y−1x−1)−1βlog⁡e(α+(y−1x−1)2)=log⁡e∣x−1∣\tan ^{-1}\left(\frac{y-1}{x-1}\right)-\frac{1}{\beta} \log _{\mathrm{e}}\left(\alpha+\left(\frac{y-1}{x-1}\right)^2\right)=\log _{\mathrm{e}}|x-1| , then 5β+α5 \beta+\alpha is equal to __________.

Step-by-Step Verified Solution

amp;dydx=x+y−2x−yamp;x=X+h,y=Y+kamp;dYdX=X+YX−Yamp;h+k−2=0 h−k=0}h=k=1amp;Y=vXamp;v+dvdX=1+v1−v⇒X−dvdX=1+v21−vamp;\begin{aligned}& \frac{d y}{d x}=\frac{x+y-2}{x-y} \\& \mathrm{x}=\mathrm{X}+\mathrm{h}, \mathrm{y}=\mathrm{Y}+\mathrm{k} \\& \frac{d Y}{d X}=\frac{X+Y}{X-Y} \\& \left.\begin{array}{l}\mathrm{h}+\mathrm{k}-2=0 \\\mathrm{~h}-\mathrm{k}=0\end{array}\right\} \mathrm{h}=\mathrm{k}=1 \\& \mathrm{Y}=\mathrm{vX} \\& v+\frac{d v}{d X}=\frac{1+v}{1-v} \Rightarrow X-\frac{d v}{d X}=\frac{1+v^2}{1-v} \\&\end{aligned}

amp;1−v1+v2dv=dXXamp;tan⁡−1v−12ln⁡(1+v2)=ln⁡∣X∣+C\begin{aligned}& \frac{1-v}{1+v^2} d v=\frac{d X}{X} \\& \tan ^{-1} v-\frac{1}{2} \ln \left(1+v^2\right)=\ln |X|+C\end{aligned}

As curve is passing through (2,1)(2,1)

amp;tan⁡−1(y−1x−1)−12ln⁡(1+(y−1x−1)2)=ln⁡∣x−1∣amp;∴α=1 and β=2amp;⇒5β+α=11\begin{aligned}& \tan ^{-1}\left(\frac{y-1}{x-1}\right)-\frac{1}{2} \ln \left(1+\left(\frac{y-1}{x-1}\right)^2\right)=\ln |x-1| \\& \therefore \alpha=1 \text { and } \beta=2 \\& \Rightarrow 5 \beta+\alpha=11\end{aligned}

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