The complementary function of (D2 - 1) v = 0 is
(a) cie + cuen (b) CHCOS + C sinx (c) C1 + 2 X
Nalue of
(d) None of these
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Answer:
Auxillary equation of above differential equation is (D
2
+1)y=0.
⇒
dx
2
d
2
y
+y=0
⇒y=Acosx+Bsinx
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