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Inverse cosine in radians


Y = acos(X)


Y = acos(X) returns the inverse cosine (arccosine) for each element of X. For real elements of X in the domain [–1, 1], acos(X) is real and in the range [0, π]. For real elements of X outside the domain [–1, 1], acos(X) is complex.

The acos function operates element-wise on arrays. The function's domains and ranges include complex values. All angles are in radians.


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Graph of Inverse Cosine Function

Graph the inverse cosine function over the domain $-1 \le x \le 1$ .

x = -1:.05:1;
plot(x,acos(x)), grid on

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Inverse Cosine

The inverse can be defined as

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