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Mathematics
Problem
lim
x
→
0
1
x
cos
−
1
(
1
−
x
2
1
+
x
2
)
\lim_{x \rightarrow 0}\frac{1}{x}\cos^{-1}\left(\frac{1 - x^2}{1 + x^2}\right)
lim
x
→
0
x
1
cos
−
1
(
1
+
x
2
1
−
x
2
)
is equal to (a) 1 (b) 0 (c) 2 (d) none of these
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