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Evaluate the expression. cos−1(−1)
A
0
B
π
C
2π
D
23π
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1
Understand that \( \cos^{-1}(x) \) is the inverse cosine function, which gives the angle whose cosine is \( x \).
Recall that the range of the inverse cosine function, \( \cos^{-1}(x) \), is \([0, \pi] \). This means the output will be an angle in radians between 0 and \( \pi \).
Identify that the expression \( \cos^{-1}(-1) \) asks for the angle whose cosine is \(-1\).
Recall that the cosine of \( \pi \) is \(-1\). Therefore, \( \cos(\pi) = -1 \).
Conclude that the angle whose cosine is \(-1\) within the range \([0, \pi] \) is \( \pi \).