The range of \[f(x)=\sec \left( \frac{\pi }{4}{{\cos }^{2}}x \right)\,,\ -\infty

\[[-\sqrt{2},\ -1]\cup [1,\ \sqrt{2}]\]

\[(-\infty ,\ -1]\cup [1,\ \infty )\]

The range of \[f(x)=\sec \left( \frac{\pi }{4}{{\cos }^{2}}x \right)\,

1.	The range of \[f(x)=\sec \left( \frac{\pi }{4}{{\cos }^{2}}x \right)\,,\ -\infty
A.	\[[1,\ \sqrt{2}]\]
B.	\[[1,\ \infty )\]
C.	\[[-\sqrt{2},\ -1]\cup [1,\ \sqrt{2}]\]
D.	\[(-\infty ,\ -1]\cup [1,\ \infty )\]
Answer» B. \[[1,\ \infty )\]

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The range of \[f(x)=\sec \left( \frac{\pi }{4}{{\cos }^{2}}x \right)\,,\ -\infty

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