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