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Byju's Answer
Standard XII
Mathematics
Formation of a Differential Equation from a General Solution
Form the diff...
Question
Form the differential equation corresponding to
y
=
A
cos
3
x
+
B
sin
3
x
, where
A
and
B
are parameters.
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Solution
y
=
A
cos
3
x
+
B
sin
3
x
....
(
1
)
Differentiate
y
′
=
−
3
A
sin
3
x
+
3
B
cos
3
x
again differentiate,
y
′′
=
−
9
A
cos
3
x
−
9
B
sin
3
x
⇒
y
′′
=
−
9
(
A
cos
3
x
+
B
sin
3
x
)
=
−
9
y
, using
(
1
)
⇒
y
′′
+
9
y
=
0
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0
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Formation of a Differential Equation from a General Solution
Standard XII Mathematics
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