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Differential Equations

Multiple Choice Questions

301. The general solution of the differential equation e^x dy + (ye^x + 2x) dx = 0 is

x e^y + x² = C
x e^y + y² = C
y e^x + x² = C
y e^x + x² = C

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Short Answer Type

302.
Find the particular solution of the differential equation
$dy over dx equals negative fraction numerator x plus y space c o s space x over denominator 1 plus s i n space x space end fraction space g i v e n space t h a t space y equals 1 space w h e n space x equals 0$

dy over dx equals negative fraction numerator straight x plus ycosx over denominator 1 plus sin space straight x end fraction rightwards double arrow space dy over dx plus fraction numerator cosx over denominator 1 plus sinx end fraction straight y equals negative fraction numerator straight x over denominator 1 plus sin space straight x end fraction space..... space left parenthesis straight i right parenthesis This space is space straight a space linear space differential space equation space with straight P space equals space fraction numerator cosx over denominator 1 plus sin space straight x end fraction comma space straight Q space space equals negative fraction numerator straight x over denominator 1 plus sin space straight x end fraction therefore comma straight I. straight F. space equals space straight e to the power of integral fraction numerator cosx over denominator 1 plus sin space straight x end fraction dx end exponent equals space space straight e to the power of log space left parenthesis 1 plus sinx right parenthesis end exponent equals 1 space plus space sin space straight x Multiplying space both space sides space of space left parenthesis straight i right parenthesis space by space straight I. straight F. space equals space 1 space plus space sin space straight x comma space we space get left parenthesis 1 plus sinx right parenthesis dy over dx plus straight y space cos space straight x space equals space minus straight x Integrating space space with space respect space to space straight x comma space we space get straight y left parenthesis 1 plus sin right parenthesis space equals integral negative xdx space plus space straight C rightwards double arrow space space straight y space equals space fraction numerator 2 straight C minus straight x squared over denominator 2 left parenthesis 1 plus sinx right parenthesis end fraction space...... space left parenthesis ii right parenthesis Given space that space straight y space equals 1 space when space straight x equals space 0 thus comma 1 space equals fraction numerator 2 straight C over denominator 2 left parenthesis 1 plus 0 right parenthesis end fraction rightwards double arrow space space straight C space equals 1 space space....... space left parenthesis iii right parenthesis Put space left parenthesis iii right parenthesis space space in space space left parenthesis ii right parenthesis comma space space we space get straight y space equals space fraction numerator 2 minus straight x squared over denominator 2 left parenthesis 1 plus sin space straight x space right parenthesis end fraction

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303.

Find the particular solution of the differential equation

2ye^x/y dx+ (Y-2xe^x/y) dy =0

Given that x=0 when y=1.

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304.

Find the differential equation of the family of lines passing through the origin.

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305.

If space straight y space equals space straight e to the power of ax. cosbx comma space then space prove space that space space space fraction numerator straight d squared straight y over denominator dx squared end fraction minus 2 straight a dy over dx plus left parenthesis straight a squared plus straight b squared right parenthesis straight y space equals space 0

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306.

If space straight x to the power of straight x plus straight x to the power of straight y plus straight y to the power of straight x space equals space straight a to the power of straight b comma space space then space find space dy over dx.

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307.

If $straight x equals straight a space sin space 2 straight t left parenthesis 1 plus cos space 2 straight t right parenthesis space and space straight y space equals straight b space cos space 2 straight t left parenthesis 1 minus cos space 2 straight t right parenthesis comma space then space find dy over dx space at space straight t space equals straight pi over 4.$

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Long Answer Type

308.

Find the particulars solution of the differential equation $straight x squared dy space equals space left parenthesis 2 xy plus straight y squared right parenthesis dx comma space$ given that y =1 when x = 1.

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309.

Find the particulars solution of the differential equation $left parenthesis 1 plus straight x squared right parenthesis dy over dx equals open parentheses straight e to the power of straight m space tan to the power of negative 1 straight x end exponent end exponent minus straight y close parentheses comma space given space that space straight y space equals space 1 space when space straight x space equals space 0.$

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Short Answer Type

310.

Solve the differential equation $left parenthesis 1 plus straight x squared right parenthesis dy over dx plus straight y equals straight e to the power of tan to the power of negative 1 end exponent straight x end exponent$