In the following, pick out the linear systems. (i)d2y(t)+ a1dy(t)+ a2y(t) = u(t)dt2dt (ii) ydy(t)+ a1y(t)= a2u(t)dt (iii) 2d2y+ tdy+ t2y(t) =5dt2dt

In the following, pick out the linear systems. (i)d2y(t)+ a1dy(t)+ a2y

1.	In the following, pick out the linear systems. (i)d2y(t)+ a1dy(t)+ a2y(t) = u(t)dt2dt (ii) ydy(t)+ a1y(t)= a2u(t)dt (iii) 2d2y+ tdy+ t2y(t) =5dt2dt
A.	(i) and (ii)
B.	(i) only
C.	(i) and (iii)
D.	(ii) and (iii)
Answer» D. (ii) and (iii)

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In the following, pick out the linear systems. (i)d2y(t)+ a1dy(t)+ a2y(t) = u(t)dt2dt (ii) ydy(t)+ a1y(t)= a2u(t)dt (iii) 2d2y+ tdy+ t2y(t) =5dt2dt

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