Question Number 101558 by mhmd last updated on 03/Jul/20

if y=sin2x is the solution of differintial equation   (d^2 y/dx^2 ) +4y=k then the k is .......

Answered by bemath last updated on 03/Jul/20

y′=2cos 2x ⇒y′′=−4sin 2x  y′′+4y=−4sin 2x+4sin 2x = 0 = k ★

Commented bymhmd last updated on 03/Jul/20

thank you sir