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Byju's Answer
Standard XII
Mathematics
Derivative of One Function w.r.t Another
Derivative of...
Question
Derivative of
(
sin
x
)
x
+
sin
−
1
√
x
with respect to
x
is
A
(
x
cot
x
+
log
sin
x
)
+
1
2
√
x
−
x
2
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B
(
x
cot
x
+
log
sin
x
)
+
1
√
x
−
x
2
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C
(
sin
x
)
x
(
x
cot
x
+
log
x
)
+
1
√
x
−
x
2
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D
(
sin
x
)
x
(
x
cot
x
+
log
sin
x
)
+
1
2
√
x
−
x
2
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Solution
The correct option is
D
(
sin
x
)
x
(
x
cot
x
+
log
sin
x
)
+
1
2
√
x
−
x
2
Let
y
=
(
sin
x
)
x
⇒
log
y
=
x
log
(
sin
x
)
Now differentiating both sides with respect to
x
1
y
d
y
d
x
=
x
cot
x
+
log
sin
x
or,
d
y
d
x
=
(
sin
x
)
x
{
x
cot
x
+
log
sin
x
}
........(1).
Again let
z
=
(
sin
x
)
x
+
sin
−
1
√
x
Now differentiating both sides with respect to
x
.
d
z
d
x
=
d
y
d
x
+
1
√
1
−
x
.
1
2
√
x
d
z
d
x
=
(
sin
x
)
x
{
x
cot
x
+
log
sin
x
}
+
1
2
√
x
−
x
2
[Using (1)]
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0
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