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Question

The order of differential equation of family of curves given by y=a1(a2+a3)cos(x+a4)a5ex+a6, is


A
6
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B
5
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C
4
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D
3
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Solution

The correct option is D 3

Substitute λ1=a1(a2+a3)
λ2=a5ea6
y=λ1cos(x+a4)a5exea6=λ1cos(x+a4)λ2ex

we made it to least number of arbitrary constants.
So the order is the total number of arbitrary constants
Therefore order is 3


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