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Mathematics
Problem
d
d
x
tan
−
1
4
x
1
−
4
x
=
\frac{d}{dx} \tan^{-1} \frac{4\sqrt{x}}{1-4x} =
d
x
d
tan
−
1
1
−
4
x
4
x
=
(a)
1
x
(
1
+
4
x
)
\frac{1}{\sqrt{x}(1+4x)}
x
(
1
+
4
x
)
1
(b)
2
x
(
1
+
4
x
)
\frac{2}{\sqrt{x}(1+4x)}
x
(
1
+
4
x
)
2
(c)
4
x
(
1
+
4
x
)
\frac{4}{\sqrt{x}(1+4x)}
x
(
1
+
4
x
)
4
(d) None of these
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