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Byju's Answer
Standard XII
Mathematics
Addition Rule of Differentiation
find derivati...
Question
find derivative of 1/x using first principle.
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Solution
Dear student,
Let
y
=
1
x
⇒
y
+
∆
y
=
1
x
+
∆
x
⇒
∆
y
=
1
x
+
∆
x
-
1
x
⇒
∆
y
=
x
-
x
-
∆
x
x
x
+
∆
x
⇒
∆
y
∆
x
=
-
∆
x
∆
x
.
x
x
+
∆
x
⇒
∆
y
∆
x
=
-
1
x
x
+
∆
x
⇒
lim
∆
x
→
0
∆
y
∆
x
=
lim
∆
x
→
0
-
1
x
x
+
∆
x
⇒
dy
dx
=
-
1
x
2
Regards
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