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1 NAME 2 acos - compute arc cosine 3 4 SYNOPSIS 5 float acos(float x) 6 7 8 DESCRIPTION 9 Return the arc cosine of the argument. 10 11 ERRORS 12 If the argument is less than -1 or larger than 1, an error will result. 13 14 SEE ALSO 15 kfun/asin, kfun/atan