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Q.

The differential equation by eliminating A,B from y=e2x (Acos3x + Bsin3x) is 

 

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a

d2ydx2+4dydx-13y=0

b

d2ydx2-4dydx-13y=0

c

d2ydx2-4dydx+13y=0

d

d2ydx2+4dydx+13y=0

answer is C.

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Detailed Solution

y=e2x (A cos3x+B sin3x)y e-2x =A cos3x+B sin3x  y-2e-2x+y1e-2x =-A3 sin3x+3B cos3x  -2y+y1 e-2x =-3A sin3x+3B cos3x  -2y1+y11 e-2x+-2y+y1 -2e-2x =-9A cos3x-9B sin3xy11-4y1+4y=-9yy11-4y1+13y=0

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