Question

 (d^3 y)/〖dx〗^3 +(d^2 y)/〖dx〗^2 +4 dy/dx+4y=0 , has the solution *

(a) y=〖c_(1 ) e〗^(-x)+〖xc〗_(2 ) e^(-x)+x^2 c_3 e^(-x)

(b) y=c_(1 ) cos2x+c_2 sin2x

(c) y=〖c_(1 ) e〗^(-x)+c_2 cos2x+c_(3 ) sin2x

(d) None of the above​

Answer 1

Answer:

none of the above......