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Question

The order of the differential equation whose general solution is given by y=(c1+c2)cos(x+c3)c4ex+c5, where c1,c2,c3,c4,c5 are arbitrary constants, is


A
5
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B
4
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C
3
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D
2
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Solution

The correct option is C 3
y=(c1+c2)cos(x+c3)c4ex+c5
=(c1+c2)cos(x+c3)c4ec5ex
Let c1+c2=c1
c4ec5=c11
y=c1cos(x+c3)c11ex
Now this equation can be represented in terms g 2 arbitrary constant and order of differential equation = number of arbitrary constant needed to write equation
=3

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