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4. Let a⁵b⁷ occurs in (r + 1)^th term of [removed]a – 2b)¹².

Now, T_r+1 = ¹²C_ra^12-r (–2b)^r

= (–1)^r12C_ra^12–r . 2^r. b^r

Comparing indices of a and b in T_r-1 with a⁵ and b⁷ we get,  r = 7

So, co-efficient of a⁵b⁷ is (–1)⁷¹²C₇ 2⁷

118. Let $y={\left(3x^2-9x+5\right)}^9$

So,  $\frac{dy}{dx}=9{\left(3x^2-9x+5\right)}^8\frac{d}{dx}\left(3x^2-9x+5\right)$

$=9{\left(3x^2-9x+5\right)}^8\times \left(6x-9\right)$

$=27{\left(3x^2-9x+5\right)}^8\left(2x-3\right)$

The given D.E.is

$\begin{array}{l}\left[xsi{n}^2\left(\frac{y}{x}\right)-y\right]dx+xdy=0\\ =\left[xsi{n}^2\left(\frac{y}{x}\right)-y\right]dx=-xdy\\ =\frac{dy}{dx}=\frac{\left[xsi{n}^2\left(\frac{y}{x}\right)-y\right]}{-x}\\ =-\left[si{n}^2\left(\frac{y}{x}\right)-\frac{y}{x}\right]=f\left(\frac{y}{x}\right)\end{array}$

i.e, the given D.E is homogenous.

Let, $y=vx=\frac{y}{x}=v$ so that, $\frac{dy}{dx}=vx\frac{dv}{dx}$ in the D.E.

$\begin{array}{l}=v+\frac{dv}{dx}=-\left[si{n}^{2}v-v\right]=v-si{n}^{2}v\\ =\frac{dv}{dx}=-si{n}^{2}v\\ =\frac{dv}{si{n}^{2}v}=-dx\end{array}$

Integrating both sides we get,

$\begin{array}{l}={\displaystyle \int cose{c}^{2}vdv={\displaystyle \int -dx}}\\ =-cotv=-log\left|x\right|+c\\ =cotv=log\left|x\right|-c\end{array}$

Putting back $v=\frac{y}{x}$ we have,

$cot\frac{y}{x}=log\left|x\right|-c$

Then, $y=\frac{\pi }{4}$ when, $x=1$

$\begin{array}{l}cot\frac{\pi }{4}=log\left|1\right|-c\\ =c=-1\end{array}$

$\therefore$ The required particular solution is,

$\begin{array}{l}cot\frac{y}{x}=log\left|x\right|+1=log\left|x\right|+logc\left\{?loge=1\right\}\\ =cot\frac{y}{x}=log\left|ex\right|\end{array}$

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The given D.E. is

. $\begin{array}{l}{x}^{2}dy+\left(xy+y^2\right)dx=0\\ =x^{2}dy=-\left(xy+y^2\right)dx\\ =\frac{dy}{dx}=-\left(\frac{xy+y^2}{x^2}\right)=-\left[\frac{y}{x}+\left(\frac{y^2}{x}\right)\right]=f\left(\frac{y}{x}\right)\end{array}$

i.e, the D.E is homogenous.

Let, $y=vx=v=\frac{y}{x}$ so that $\frac{dy}{dx}=v+x\frac{dv}{dx}$ in the given D.E.

Then, $v+x\frac{dv}{dx}=-\left[v+v^2\right]=-v-v^2$

$\begin{array}{l}=x\frac{dv}{dx}=-2v-v^2=-v\left(2+v\right)\\ =\frac{dv}{v\left(2+v\right)}=-\frac{dx}{x}\end{array}$

Integrating both sides we get,

$\begin{array}{l}{\displaystyle \int \frac{dv}{v\left(2+v\right)}=-{\displaystyle \int \frac{dx}{x}}}\\ =\frac{1}{2}{\displaystyle \int \frac{2dv}{2\left(v+2\right)}=}-{\displaystyle \int \frac{dx}{x}}\\ =\frac{1}{2}{\displaystyle \int \frac{v+2-v}{v\left(v+2\right)}}dv={\displaystyle \int -\frac{dx}{x}}\\ =\frac{1}{2}\left\{{\displaystyle \int \frac{1}{v}dv-\frac{1}{v+2}dv}\right\}={\displaystyle \int -\frac{dx}{x}}\end{array}$

$\begin{array}{l}=\frac{1}{2}\left[logv-log\left|v+2\right|\right]=-logx+logc\\ =\frac{1}{2}log\left(\frac{v}{v+2}\right)=log\frac{c}{x}\\ =log{\left(\frac{v}{v+2}\right)}^{\frac{1}{2}}=log\frac{c}{x}\\ ={\left(\frac{v}{v+2}\right)}^{\frac{1}{2}}=\frac{c}{x}\\ =\frac{v}{v+2}={\left(\frac{c}{x}\right)}^2\end{array}$

Putting back $v=\frac{y}{x}$ we get,

$\begin{array}{l}=\frac{\frac{y}{x}}{\frac{y}{x}+2}={\left(\frac{c}{x}\right)}^2\\ =\frac{y}{y+2x}={\left(\frac{c}{x}\right)}^2\\ =\frac{x^{2}y}{y+2x}=c^2\end{array}$

Given, y = 1 when x = 1

So, $=\frac{1}{1+2}=c^2=c^2=\frac{1}{3}$

Hence, the required particular solution is,

$\begin{array}{l}=\frac{x^{2}y}{y+2x}=\frac{1}{3}\\ =3x^{2}y=y+2x\end{array}$

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The given D.E. is

$\begin{array}{l}\left(x+y\right)dy+\left(x-y\right)dx=0\\ =\left(x+y\right)dy=-\left(x-y\right)dx\\ =\frac{dy}{dx}=\frac{y-x}{x+y}=\frac{\frac{y-x}{x}}{\frac{x+y}{y}}=\frac{\frac{y}{x}-1}{1+\frac{y}{x}}=f\left(\frac{y}{x}\right)\end{array}$

i.e, homogenous

Let, $y=vx=v=\frac{y}{x}$ so that $\frac{dy}{dx}=v+y\frac{dy}{dx}$ in the D.E.

Then, $v+x\frac{dv}{dx}=\frac{v-1}{v+1}$

$\begin{array}{l}=x\frac{dv}{dx}=\frac{v-1}{v+1}-v=\frac{v-1-v^2-v}{v+1}=-\frac{\left(v^2+1\right)}{v+1}\\ =\left[\frac{v+1}{v^2+1}\right]dv=-\frac{dx}{x}\end{array}$

Integrating both sides,

$\begin{array}{l}{\displaystyle \int \frac{v+1}{v^2+1}dv={\displaystyle \int -\frac{dx}{x}}}\\ =\frac{1}{2}{\displaystyle \int \frac{2v}{v^2+1}}dv+{\displaystyle \int \frac{1}{v^2+1}dv=-logx+c}\\ =\frac{log\left|v^2+1\right|}{2}+ta{n}^{-1}v=-logx+c\end{array}$

Putting back $v=\frac{y}{x}$ we get,

$\begin{array}{l}=\frac{1}{2}log\left|\frac{y^2}{x^2}+1\right|+ta{n}^{-1}\frac{y}{x}=-logx+c\\ =\frac{1}{2}\left[log\left(y^2+x^2\right)-log{x}^2\right]+ta{n}^{-1}\frac{y}{x}+logx=c\\ =\frac{1}{2}log\left(y^2+x^2\right)-\frac{1}{2}log{x}^2+logx+ta{n}^{-1}\frac{y}{x}=c\\ =\frac{1}{2}log\left(y^2+x^2\right)-logx+logx+ta{n}^{-1}\frac{y}{x}=c\\ =\frac{1}{2}log\left(y^2+x^2\right)+ta{n}^{-1}\frac{y}{x}=c\end{array}$

Given, $y=1,when,x=1$

So, $=\frac{1}{2}log\left(1^2+1^2\right)+ta{n}^{-1}\frac{1}{1}=c$

$=\frac{1}{2}log2+\frac{\pi }{4}=c$

Hence, the particular solution is

$\frac{1}{2}log\left(1^2+1^2\right)+ta{n}^{-1}\frac{y}{x}=\frac{1}{2}log2+\frac{\pi }{4}$

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The given D.E. is

$\begin{array}{l}\left(1+e^{\frac{x}{y}}\right)dx+e^{\frac{x}{y}}\left(1-\frac{x}{y}\right)dy=0\\ \Rightarrow \left(1+e^{\frac{x}{y}}\right)dx=-e^{\frac{x}{y}}\left(1-\frac{x}{y}\right)dy\\ \Rightarrow \frac{dx}{dy}=-\frac{e^{\frac{x}{y}}\left(1-\frac{x}{y}\right)}{1+e^{\frac{x}{y}}}=f\left(\frac{x}{y}\right)\end{array}$

Hence, the given D.E. is homogenous.

Let, $x=yv=\frac{y}{x}$ so that $\frac{dy}{dx}=v+y\frac{dx}{dy}$ in the D.E.

Then, $v+y\frac{dv}{dy}=\frac{-e^v\left(1-v\right)}{1+e^v}$

$\begin{array}{l}\Rightarrow y\frac{dv}{dy}=\frac{v{e}^v-e^v}{1+e^v}-v=\frac{v{e}^v-e^v-v-v{e}^v}{1+e^v}\\ \Rightarrow y\frac{dv}{dy}=-\frac{\left(e^v+v\right)}{1+e^v}\\ \Rightarrow \left(\frac{1+e^v}{e^v+v}\right)dv=-\frac{dy}{y}\end{array}$

Integrating both sides we get,

$log\left|e^v+v\right|=-log\left|y\right|+log\left|c\right|$

Putting back $v=\frac{x}{y}$ we get,

$\begin{array}{l}log\left|e^{\frac{x}{y}}+\frac{x}{y}\right|=log\left|\frac{c}{y}\right|\\ =e^{\frac{x}{y}}+\frac{x}{y}=\frac{c}{y}\end{array}$

$=x+y{e}^{\frac{x}{y}}=c$ is the general solution.

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