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Mathematics
Problem
cos
−
1
1
−
x
+
sin
−
1
1
−
x
=
\cos^{-1} \sqrt{1-x} + \sin^{-1} \sqrt{1-x} =
cos
−
1
1
−
x
+
sin
−
1
1
−
x
=
(a)
π
\pi
π
(b)
π
2
\frac{\pi}{2}
2
π
(c) 1 (d) 0
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