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Mathematics
Mathematics
Problem
If
π
≤
x
≤
2
π
\pi \leq x \leq 2\pi
π
≤
x
≤
2
π
, then
cos
−
1
(
cos
x
)
\cos^{-1}(\cos x)
cos
−
1
(
cos
x
)
is equal to (a)
x
x
x
(b)
π
−
x
\pi - x
π
−
x
(c)
2
π
+
x
2\pi + x
2
π
+
x
(d)
2
π
−
x
2\pi - x
2
π
−
x
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