Which of the following is the principal value branch of \[\cos e{{c}^{

1.	Which of the following is the principal value branch of \[\cos e{{c}^{-1}}x?\]
A.	\[\left( \frac{-\pi }{2},\frac{\pi }{2} \right)\]
B.	\[(0,\pi )-\left[ \frac{\pi }{2} \right]\]
C.	\[\left[ \frac{-\pi }{2},\frac{\pi }{2} \right]\]
D.	\[\left[ \frac{-\pi }{2},\frac{\pi }{2} \right]-\{0\}\]
Answer» E.

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Which of the following is the principal value branch of \[\cos e{{c}^{-1}}x?\]

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