Y = acos(X)Y = acosh(X)
acos and acosh operate element-wise on matrices. Their domains and ranges include complex values. All angles are in radians.
acos(X) returns the inverse cosine for each element of X. For real elements of X in the range [-1,1], acos(X) is real and in the range [0,pi]. For real elements of X outside the range [-1,1], acos(X) has nonzero imaginary parts.
acosh(X) returns the inverse hyperbolic cosine for each element of X.
-1 <= x <= 1.
x = -1:.05:1;plot(x,acos(x))
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(c) Copyright 1994 by The MathWorks, Inc.