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Byju's Answer
Standard XII
Mathematics
Local Maxima
If edy/dx=x...
Question
If
e
d
y
/
d
x
=
x
+
1
given that when
x
=
0
,
y
=
3
then minimum (local) value of
y
=
f
(
x
)
is
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Solution
e
d
y
/
d
x
=
x
+
1
Taking natural log of both sides,
d
y
d
x
=
l
n
(
x
+
1
)
= 0 (for local minima)
⇒
x
+
1
=
1
⇒
x
=
0
It is already given that at x = 0 , y = 3 . Thus, at local minima
x
=
0
,
y
=
f
(
x
)
=
3
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