(24) Let elt-x)A - B(x) 9(A) = (25) et Differentiating o(A) and setting the derivative equal to zero, we find that A' = -In (26) 1- is the maximum value point of the function o (A). Therefore, we know

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
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I Need expanation to know why Author Differentiating φ(A) and setting the derivative equal to
zero.

ell-3)A – B(x)
SE
sup
E.neRe-z4 > B(x)
e4
(24)
Let
e(1-3)A – B(x)
9(A) =
(25)
e4
Differentiating o (A) and setting the derivative equal to
zero, we find that
A =
-In
1-x
(26)
is the maximum value point of the function o (A). Therefore,
we know
Transcribed Image Text:ell-3)A – B(x) SE sup E.neRe-z4 > B(x) e4 (24) Let e(1-3)A – B(x) 9(A) = (25) e4 Differentiating o (A) and setting the derivative equal to zero, we find that A = -In 1-x (26) is the maximum value point of the function o (A). Therefore, we know
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