Recent questions in Differential Equations

The number of solutions of $\Large\frac{dy}{dx}=\Large\frac{y+1}{x-1}$ when y(1)=2 is $(A)\;none\quad(B)\;one\quad(C)\;two\quad(D)\;infinite$

asked Jan 18, 2013 by sreemathi.v

1 answer

Solution of $\Large \frac{dy}{dx}$ $-y=1,y(0)=1$ is given by $(A)\;xy=-e^x\quad(B)\;xy=-e^{-x}\quad(C)\;xy=-1\quad(D)\;y=2e^x-1$

asked Jan 18, 2013 by sreemathi.v

1 answer

Integrating factor of $x\Large \frac{dx}{dy}\normalsize-y=x^4-3x$ is $(A)\;x\quad(B)\;log x\quad(C)\;\frac{1}{x}\quad(D)\;-x$

asked Jan 18, 2013 by sreemathi.v

1 answer

Family $y=Ax+A^3$ of curves is represented by the differential equation of degree $(A)\;1\quad(B)\;2\quad(C)\;3\quad(D)\;4$

asked Jan 18, 2013 by sreemathi.v

1 answer

Solution of the differential equation $\tan y\sec^2x dx+\tan x\sec^2y dy=0$ is $(A)\;\tan x+\tan y=c \quad (B)\;\tan x-\tan y=c \quad(C)\;\frac{\tan x}{\tan y}=c \quad (D\;\tan x.tan y=c$

asked Jan 18, 2013 by sreemathi.v

1 answer

Integrating factor of the differential equation $\cos x\large\frac{dy}{dx}$ $+y\sin x=1$ is: $(A)\;\cos x\quad(B)\;\tan x\quad(C)\;\sec x\quad(D)\;\sin x$

asked Jan 18, 2013 by sreemathi.v

1 answer

Solution of differential equation $x dy-y dx=0$ represents:

asked Jan 18, 2013 by sreemathi.v

1 answer

The differential equation for $y=A\cos\alpha x+B\sin\alpha x,$ where A and B are arbitrary constants is $\begin{array}{1 1}(A)\;\frac{d^2y}{dx^2}+x^2y=0 & (B)\;\frac{d^2y}{dx^2}+\alpha^2y=0\\(C)\;\frac{d^2y}{dx^2}+y=0 & (D)\;\frac{d^2y}{dx^2}-y=0\end{array}$

asked Jan 18, 2013 by sreemathi.v

1 answer

If $y=e^{-x}(A\cos x+B\sin x)$ , then $y$ is a solution of

asked Jan 18, 2013 by sreemathi.v

1 answer

The order and degree of the differential equation $\large\frac{d^2y}{dx^2}+\bigg(\frac{dy}{dx}\bigg)^{\frac{1}{4}}+x^{\frac{1}{5}}=0$ ,respectively,are $(A)\;2\;and\;not\;defined\quad(B)\;2\;and\;2\quad(C)\;2\;and\;3\quad(D)\;3\;and\;3$

asked Jan 18, 2013 by sreemathi.v

1 answer

The degree of the differential equation $1+\bigg[\bigg(\large\frac{dy}{dx}\bigg)^2\bigg]^{\large\frac{3}{2}}=\frac{d^2y}{dx^2}$ is: $(A)\;4\quad(B)\;\frac{3}{2}\quad(C)\;not\;defined\quad(D)\;2$

asked Jan 18, 2013 by sreemathi.v

1 answer

The degree of the differential equation $\large\bigg(\frac{d^2y}{dx^2}\bigg)^2+\bigg(\frac{dy}{dx}\bigg)^2$ $=x\sin \bigg(\large\frac{dy}{dx}\bigg)$ is: $(A)\;1\quad(B)\;2\quad(C)\;3\quad(D)\;not\;defined$

asked Jan 18, 2013 by sreemathi.v

1 answer

Solve: $x\large \frac{dy}{dx}$ $=y(\log y-\log x+1)$

asked Jan 18, 2013 by sreemathi.v

1 answer

Find the equation of a curve passing through the point (1,1).If the tangent drawn at any point P(x,y) on the curve meets the coordinate axes at A and B such that P is the mid-point of AB.

asked Jan 18, 2013 by sreemathi.v

1 answer

Find the equation of a curve passing through origin if the slope of the tangent to the curve at any point $(x,y)$ is equal to the square of the difference of the abscissa and the ordinate of the point.

asked Jan 18, 2013 by sreemathi.v

1 answer

Find the equation of the curve through the point (1,0) if the slope of the tangent to the curve at any point (x,y) is $\Large \frac{y-1}{x^2+x}.$

asked Jan 18, 2013 by sreemathi.v

1 answer

Find the equation of a curve passing through (2,1) if the slope of the tangent to the curve at any point (x,y) is $\Large \frac{x^2+y^2}{2xy}.$

asked Jan 18, 2013 by sreemathi.v

1 answer

Find the general solution of $\large \frac{dy}{dx}$ $+3y=\sin 2x$

asked Jan 18, 2013 by sreemathi.v

1 answer

Solve : $\large\frac{dy}{dx}$ $=\cos (x+y)+\sin (x+y)$ .[Hint :Substitute x+y=z]

asked Jan 18, 2013 by sreemathi.v

1 answer

FInd the general solution of $(1+\tan y)(dx-dy)+2xdy=0$

asked Jan 18, 2013 by sreemathi.v

1 answer

Solve: $y+\large\frac{d}{dx}$ $(xy)=x(\sin x+log x)$

asked Jan 18, 2013 by sreemathi.v

1 answer

Find the differential equation of system of concentric circles with centre(1,2).

asked Jan 18, 2013 by sreemathi.v

1 answer

Solve the differential equation $(1+y^2)\tan^{-1}xdx+2y(1+x^2)dy=0$

asked Jan 18, 2013 by sreemathi.v

1 answer

Form the differential equation by eliminating A and B in $Ax^2+By^2=1$ .

asked Jan 18, 2013 by sreemathi.v

1 answer

Solve the differential equation $dy=\cos x(2-y\; cosec x)dx$ given that $y=2$ when $x=\Large\frac{\pi}{2}$ .

asked Jan 18, 2013 by sreemathi.v

1 answer

Solve: $2(y+3)-xy\Large\frac{dy}{dx}\normalsize =0,$ given that $y(1)=-2$

asked Jan 18, 2013 by sreemathi.v

1 answer

Solve: $(x+y)(dx-dy)=dx+dy.$ [Hint:Substitute x+y=z after separating dx and dy]

asked Jan 18, 2013 by sreemathi.v

1 answer

Find the general solution of $y^2dx+(x^2-xy+y^2)dy=0$

asked Jan 18, 2013 by sreemathi.v

1 answer

Find the general solution of the differential equation $(1+y^2)+(x-e^{\large\tan^{-1}y})\Large \frac{dy}{dx}$ =0

asked Jan 18, 2013 by sreemathi.v

1 answer

Solve: $x^2\Large \frac{dy}{dx}\normalsize =x^2+xy+y^2$

asked Jan 18, 2013 by sreemathi.v

1 answer

Find the equation of a curve passing through origin and satisfying the differential equation $(1-x^2)\Large \frac{dy}{dx}\normalsize-2xy=4x^2$

asked Jan 18, 2013 by sreemathi.v

1 answer

Form the differential equation of all circles which pass through origin and whose centers lie on y-axis as shown below:

asked Jan 18, 2013 by sreemathi.v

1 answer

Form the differential equation having $y=(\sin^{-1}x)^2+A\cos^{-1}x+B,$ where A and B are arbitrary constants,as its general solution.

asked Jan 18, 2013 by sreemathi.v

1 answer

If y(t) is a solution of $(1+t)\Large\frac{dy}{dt}\normalsize-ty=1$ and $y(0)=-1,$ then show that y(1)= $-\Large \frac{1}{2}$

asked Jan 18, 2013 by sreemathi.v

1 answer

If y(x) is a solution of $\Large\frac{2-\sin x}{1-y}\bigg(\frac{dy}{dx}\bigg)\normalsize=-\cos x$ and y(0)=1,then find the value of $\frac{1}{2}.$

asked Jan 18, 2013 by sreemathi.v

1 answer

Find the general solution of $(x+2y^3)\Large \frac{dy}{dx}\normalsize =y \;dx$

asked Jan 17, 2013 by sreemathi.v

1 answer

Solve the differential equation $\Large \frac{dy}{dx}\normalsize=1+x+y^2+xy^2,$ when y=0,x=0.

asked Jan 17, 2013 by sreemathi.v

1 answer

Solve: $y\;dx-x\;dy=x^2y\;dx$

asked Jan 17, 2013 by sreemathi.v

1 answer

Solve the differential equation $\Large\frac{dy}{dx}\normalsize+1=e^{x+y}$

asked Jan 17, 2013 by sreemathi.v

1 answer

Find the general solution of $\Large \frac{dy}{dx}\normalsize =ay-e^{mx}$

asked Jan 17, 2013 by sreemathi.v

1 answer

Solve the differential equation $\Large \frac{dy}{dx}\normalsize =2xy-y$

asked Jan 17, 2013 by sreemathi.v

1 answer

Solve the differential equation $(x^2-1)\Large \frac{dy}{dx}\normalsize +2xy=\Large \frac{1}{x^2-1}$

asked Jan 17, 2013 by sreemathi.v

1 answer

Given that $\large \frac{dy}{dx} = e^{-2y}$ and $y=0$ when $x=5$ . Find the value of $x$ when $y=3$ .

asked Jan 17, 2013 by sreemathi.v

1 answer

Find the differential equation of all non vertical lines in a plane.

asked Jan 17, 2013 by sreemathi.v

1 answer

Find the solution of $\Large \frac{dy}{dx}\normalsize =2^{y-x}.$

asked Jan 17, 2013 by sreemathi.v

1 answer

For the differential equations, find the particular solution satisfying the given condition: $\bigg[ x \: sin^2 \bigg( \frac{x}{y} - y \bigg) \bigg] dx + xdy = 0; y \frac{\large \pi}{\large 4} when \: x = 1$

asked Dec 12, 2012 by thanvigandhi_1

1 answer

Show that the differential equation is homogeneous and solve : $\bigg( 1 + e^{\Large\frac{x}{y}} \bigg) dx + e^{\Large\frac{x}{y}} \bigg( 1 -\large \frac{x}{y} \bigg)$ $dy= 0$

asked Dec 12, 2012 by thanvigandhi_1

1 answer

Verify that the given function(explicit or implicit)is a solution of the corresponding differential equation $y=e^x+1\qquad:\;y''-y'=0$

asked Nov 30, 2012 by sreemathi.v

1 answer

Verify that the given function(explicit or implicit)is a solution of the corresponding differential equation $y=x^2+2x+C\qquad:\;y'-2x-2=0$

asked Nov 30, 2012 by sreemathi.v

1 answer

Verify that the given function(explicit or implicit)is a solution of the corresponding differential equation $y=\cos x+C\qquad:y'+\sin x=0$

asked Nov 30, 2012 by sreemathi.v

1 answer

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