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Showing posts with label differential equation. Show all posts
Showing posts with label differential equation. Show all posts

Thursday, January 26, 2017

form the differential equation of the family of circles in the first quadrant which touch the coordinate axes

form the differential equation of the family of circles in the first quadrant which touch the coordinate axes

Take the radius as r so that the centre is (r,r)
write the equation of the circle in terms of r
r is the aribitrary constant.
so differentiate it one time with respect to x and use
that to solve for r
substitute into (x-r) and (y-r) and substitute into the equation of the
circle to eliminate r





solution of a second order differential equation using reduction of order
solve y"-y = 0 if y = coshx is one of the solutions
using the formula for reduction of order
solution of solution of a second order differential equation using reduction of order

variation of parameter method

solve xy" - 4y' = x^4 by method of variation of parameter
solution to problem on differential questions using variation of parameter method

orthogonal trajectory of y(1+x ² ) = Cx

find the orthogonal trajectory of y(1+x ² ) = Cx
answer to problem on  orthogonal trajectory of y(1+x ² ) = Cx

orthogonal trajectory of y = (k/x)

find the orthogonal trajectory of y = (k/x)
solution to  find the orthogonal trajectory of y = (k/x)



formulae on integration
 
PAGE 1 BASIC INTEGRATION

PAGE 2 INTEGRATION BY SUBSTITUTION

 PAGE 3 INTEGRATION BY COMPLETION OF SQUARES

PAGE 4 INTEGRATION BY PARTS

PAGE 5 INTEGRATION BY MANIPULATION OF NUMERATOR IN TERMS OF DENOMINATOR


PAGE 6 INTEGRATION USING PARTIAL FRACTIONS

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Wednesday, January 28, 2009

orthogonal trajectory of y(1+x ² ) = Cx

find the orthogonal trajectory of y(1+x ² ) = Cx
first form the differential equation of the given family
replace (dy/dx) with -1 / (dy/dx) to get the differential equation of the orthogonal trajectory
and solve the resulting equation

another example:orthogonal trajectory of y = (k/x)
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Thursday, November 20, 2008

variation of parameter method

solve xy" - 4y' = x^4 by method of variation of parameter
make the coefficient of y" unity by dividing by x

find CF in the form Ay1 + By2 (using trial and error or some other method)
find the wronskian
and then find the PI as shown below





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Monday, October 20, 2008

solving a second order differential equation

solve y"-y'+y = 1

rewrite the equation as (D²-D+1)y = 1
replace D with m to get the auxilary equation
write the C.F. and then proceed to the particular integral (PI)

Find p If Two Lines Are Perpendicular | 3D Geometry Solution

 If the lines (x - 3)/1 = (1 - y)/1 = (z + 2)/p and (2 - x)/3 = (y + 1)/5 = (z + 56)/2p are perpendicular to each other, then find the value...