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Mathematics
Problem
d
d
x
(
cot
2
x
−
1
cot
2
x
+
1
)
=
\frac{d}{dx} \left(\frac{\cot^2 x - 1}{\cot^2 x + 1}\right) =
d
x
d
(
c
o
t
2
x
+
1
c
o
t
2
x
−
1
)
=
(a)
−
sin
2
x
-\sin 2x
−
sin
2
x
(b)
2
sin
2
x
2\sin 2x
2
sin
2
x
(c)
2
cos
2
x
2\cos 2x
2
cos
2
x
(d)
−
2
sin
2
x
-2\sin 2x
−
2
sin
2
x
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