What is the range of the inverse cosine function?

The range of the inverse cosine function, denoted as cos^(-1)(x) or arccos(x), is the set of possible output values that the function can produce. The inverse cosine function takes an input value from the interval [-1, 1], which represents the cosine values of angles.

For the output, the inverse cosine function specifically gives angles whose cosine values correspond to the provided input. The output angles are constrained to the interval from 0 to π radians (0 to 180 degrees). This is because the function is defined such that for any valid input in the range of cosine, the returned angle is in this principal range, ensuring that each input corresponds to a unique output.

Thus, the correct answer indicating the range of the inverse cosine function is the interval [0, π].