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What library does the arccos function exist in

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#include <cmath>

double answer = std::acos(thingy);

Link with -lm (I think, I dunno)

[edited by - Doc on May 30, 2004 9:30:19 PM]

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Use math.h acos(double blah). You can use bool _isnan(acos(number)) to determine whether its a number or not.

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