5. If the characteristic equation of the differential equation

\({d^2y\over dx^2}+2\alpha{dy\over dx}+y=0\)

has two equal roots, then the values of  α are

(A) ±1

(B) 0,0

(C) ±j

(D) ±1/2

Hint: 
Explanation: 

Answer-(A) ±1
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