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Restricting cosine to [0, pi] gives a bijection onto which interval?
A[0, pi]
B[0, 1]
C[-1, 1]
D[-pi, pi]
Answer & Solution
Correct answer: C. [-1, 1]
On [0, pi] cosine decreases steadily from 1 to -1, covering [-1, 1] once.
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