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CD ROM Paradise Collection 4
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CD ROM Paradise Collection 4 1995 Nov.iso
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ACOS.LI
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1993-10-16
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164b
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6 lines
# acos(x) is the arc cosine function of x, the inverse function of
# cos(x).
# See also: cos(x)
acos(x_) := if ( isnumber(x) and numeric==on, -i*acosh(x) )