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Mathematics
Mathematics
Problem
If
y
=
cos
−
1
(
x
−
x
−
1
x
+
x
−
1
)
y = \cos^{-1} \left( \frac{x - x^{-1}}{x + x^{-1}} \right)
y
=
cos
−
1
(
x
+
x
−
1
x
−
x
−
1
)
, then
d
y
d
x
\frac{dy}{dx}
d
x
d
y
is
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