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Solve the following differential equation. y3-dydx=xdydx - Mathematics and Statistics

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प्रश्न

Solve the following differential equation.

`y^3 - dy/dx = x dy/dx`

बेरीज
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उत्तर

`y^3 - dy/dx = x dy/dx`

∴ `y^3 = (1+x) dy/dx`

∴ `dx/((1+x)) = dy/y^3`

Integrating on both sides, we get

`intdx/(1+x )= int dy/y^3`

∴ `log | 1+x| = -1/(2y^2 )+c`

∴ 2y2 log | 1 + x | = – 1 + 2y2c

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पाठ 8: Differential Equation and Applications - Exercise 8.3 [पृष्ठ १६५]

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बालभारती Mathematics and Statistics 1 (Commerce) [English] Standard 12 Maharashtra State Board
पाठ 8 Differential Equation and Applications
Exercise 8.3 | Q 1.4 | पृष्ठ १६५

संबंधित प्रश्‍न

\[x + \left( \frac{dy}{dx} \right) = \sqrt{1 + \left( \frac{dy}{dx} \right)^2}\]

Verify that y = \[\frac{a}{x} + b\] is a solution of the differential equation
\[\frac{d^2 y}{d x^2} + \frac{2}{x}\left( \frac{dy}{dx} \right) = 0\]


Verify that y = cx + 2c2 is a solution of the differential equation 

\[2 \left( \frac{dy}{dx} \right)^2 + x\frac{dy}{dx} - y = 0\].

\[\frac{dy}{dx} = \log x\]

\[\frac{dy}{dx} - x \sin^2 x = \frac{1}{x \log x}\]

Solve the differential equation \[\frac{dy}{dx} = e^{x + y} + x^2 e^y\].

\[xy\frac{dy}{dx} = y + 2, y\left( 2 \right) = 0\]

\[\frac{dy}{dx} = 2 e^x y^3 , y\left( 0 \right) = \frac{1}{2}\]

\[\frac{dr}{dt} = - rt, r\left( 0 \right) = r_0\]

\[\frac{dy}{dx} = 1 + x^2 + y^2 + x^2 y^2 , y\left( 0 \right) = 1\]

\[2\left( y + 3 \right) - xy\frac{dy}{dx} = 0\], y(1) = −2

\[\cos^2 \left( x - 2y \right) = 1 - 2\frac{dy}{dx}\]

(x + y) (dx − dy) = dx + dy


\[\frac{dy}{dx} = \frac{x + y}{x - y}\]

Solve the following initial value problem:
\[\frac{dy}{dx} + y \cot x = 4x\text{ cosec }x, y\left( \frac{\pi}{2} \right) = 0\]


The population of a city increases at a rate proportional to the number of inhabitants present at any time t. If the population of the city was 200000 in 1990 and 250000 in 2000, what will be the population in 2010?


Experiments show that radium disintegrates at a rate proportional to the amount of radium present at the moment. Its half-life is 1590 years. What percentage will disappear in one year?


The slope of a curve at each of its points is equal to the square of the abscissa of the point. Find the particular curve through the point (−1, 1).


The integrating factor of the differential equation (x log x)
\[\frac{dy}{dx} + y = 2 \log x\], is given by


The integrating factor of the differential equation \[x\frac{dy}{dx} - y = 2 x^2\]


The differential equation `y dy/dx + x = 0` represents family of ______.


Form the differential equation from the relation x2 + 4y2 = 4b2


Choose the correct alternative.

The integrating factor of `dy/dx -  y = e^x `is ex, then its solution is


A solution of differential equation which can be obtained from the general solution by giving particular values to the arbitrary constant is called ______ solution


State whether the following statement is True or False:

The integrating factor of the differential equation `("d"y)/("d"x) - y` = x is e–x 


Solve the following differential equation `("d"y)/("d"x)` = x2y + y


Verify y = `a + b/x` is solution of `x(d^2y)/(dx^2) + 2 (dy)/(dx)` = 0

y = `a + b/x`

`(dy)/(dx) = square`

`(d^2y)/(dx^2) = square`

Consider `x(d^2y)/(dx^2) + 2(dy)/(dx)`

= `x square + 2 square`

= `square`

Hence y = `a + b/x` is solution of `square`


Solve the following differential equation `("d"y)/("d"x)` = cos(x + y)

Solution: `("d"y)/("d"x)` = cos(x + y)    ......(1)

Put `square`

∴ `1 + ("d"y)/("d"x) = "dv"/("d"x)`

∴ `("d"y)/("d"x) = "dv"/("d"x) - 1`

∴ (1) becomes `"dv"/("d"x) - 1` = cos v

∴ `"dv"/("d"x)` = 1 + cos v

∴ `square` dv = dx

Integrating, we get

`int 1/(1 + cos "v")  "d"v = int  "d"x`

∴ `int 1/(2cos^2 ("v"/2))  "dv" = int  "d"x`

∴ `1/2 int square  "dv" = int  "d"x`

∴ `1/2* (tan("v"/2))/(1/2)` = x + c

∴ `square` = x + c


Solve the differential equation `dy/dx + xy = xy^2` and find the particular solution when y = 4, x = 1.


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