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Mathematics
Problem
Which of the following is
d
d
x
(
cot
x
)
\dfrac{d}{dx}(\cot x)
d
x
d
(
cot
x
)
? a)
−
csc
x
cot
x
-\csc x\,\cot x
−
csc
x
cot
x
b)
csc
2
x
\csc^{2}x
csc
2
x
c)
−
csc
2
x
-\csc^{2}x
−
csc
2
x
d)
sec
2
x
\sec^{2}x
sec
2
x
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