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Arccosine of sine of x.
The arccosine of sine of x is equal to (when k is integer number k∈ℤ):
arccos( sin x ) = π/2 - arcsin( sin x )
= π/2 - (x+2kπ)
= -x - 2kπ + π/2
= -x + (0.5-2k)π
Arccos function ►