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Evaluate $\arccos x$ (#484)
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Evaluate $\arccos x$ (#484)
Find the angle
θ
∈
[
0
,
π
]
\theta \in [0, \pi]
θ
∈
[
0
,
π
]
such that
cos
θ
=
x
\cos \theta = x
cos
θ
=
x
.