Sanjay Gupta, Dev Samaj College For Women, Ferozepur City
EXACT DIFFERENTIAL EQUATIONS CHAPTER - 1
EXERCISE 1.2
Q.1
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Sanjay Gupta, Dev Samaj College For Women, Ferozepur City
Q.2
Q.3
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Q.4
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Q.5
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Q.6
Q.7
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WORKING RULE FOR SOLVING EXACT OR NON-EXACT DIFFERENTIAL EQUATIONS OF FIRST ORDER AND FIRST DEGREE
Differential Equation
Mdx Ndy 0 …………..(1)
IF
M N , then equation (1) is EXACT y x
IF
M N , then equation (1) is NOT EXACT y x
Its Solution is
M dx (Terms of N not containing x ) dy c
Using Inspection Method
Using Standard Rules
y Cons tan t
Rule-I If (1) is Homogeneous Equation, then 1 I.F. Mx Ny where Mx Ny 0
Rule-II If (1) is of the form y f ( xy) dx x g ( xy) dy 0 , 1 then I.F. Mx Ny where Mx Ny 0
Rule-III
Rule-IV
M N y x f (x) , If N f ( x ) dx then I.F. e
N M x y g (y ) , If M g ( y ) dy then I.F. e
Rule-V If (1) is of the form
x a y b (my dx nx dy) x a y b (my dx nx dy) 0 , then I.F. x h y k where a h 1 b k 1 a h 1 b k 1 and m n m n
Multiplying equation (1) by I.F. obtained in each Rule so that it will become exact differential equation and hence its solution is given by M dx (Terms of N not containing x ) dy c . y Cons tan t
Designed by : SANJAY GUPTA
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EXACT DIFFERENTIAL FORMS USED IN INSPECTION METHOD
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