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