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Byju's Answer
Standard XII
Mathematics
Equation of Normal at a Point (x,y) in Terms of f'(x)
Find the gene...
Question
Find the general solution of the differential equation dy/dx - y = sin x
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Solution
dy
dx
-
y
=
sin
x
The
above
is
a
linear
differential
equation
of
the
form
of
dy
dx
+
Py
=
Q
,
where
P
=
-
1
;
Q
=
sin
x
Now
,
IF
=
e
∫
Pdx
=
e
∫
-
dx
=
e
-
x
Now
,
the
solution
of
the
above
equation
is
given
by
y
×
IF
=
∫
Q
×
IF
dx
+
C
⇒
ye
-
x
=
∫
sin
x
×
e
-
x
dx
+
C
.
.
.
.
1
Let
I
1
=
∫
e
-
x
sin
x
dx
.
.
.
.
2
⇒
I
1
=
sin
x
×
-
e
-
x
-
∫
cos
x
×
-
e
-
x
dx
⇒
I
1
=
-
e
-
x
sin
x
+
∫
e
-
x
cos
x
dx
⇒
I
1
=
-
e
-
x
sin
x
+
cos
x
×
-
e
-
x
-
∫
-
sin
x
×
-
e
-
x
dx
⇒
I
1
=
-
e
-
x
sin
x
-
e
-
x
cos
x
-
∫
e
-
x
sin
x
dx
⇒
I
1
=
-
e
-
x
sin
x
-
e
-
x
cos
x
-
I
1
Using
2
⇒
2
I
1
=
-
e
-
x
sin
x
+
cos
x
⇒
I
1
=
-
e
-
x
2
sin
x
+
cos
x
Now
,
from
1
,
we
get
ye
-
x
=
-
e
-
x
2
sin
x
+
cos
x
+
C
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