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Which of the following is (are) true? ...

Which of the following is (are) true?
I. `sin^(-1)1+sin^(-1)(-1)=0`
II. `cos^(-1)1+cos^(-1)(-1)=0`
III. `cos^(-1)x=cos^(-1)(-x)` for all x in the domain of `cos^(-1)`

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