5.123:
a) See Exercise 5.38;
).
sin
(cos
k
k
θ
θ
w
F
μ
μ
+
=
b)
c) The expression for
F
is a minimum when the denominator is a maximum; the
calculus is identical to that of Problem 5.77 (maximizing
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 Calculus, Sin, Cos, extra figure

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