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Find the range of f(x)=sec(pi/4cos^2x), ...

Find the range of `f(x)=sec(pi/4cos^2x),` where `-oo

A

`[1,sqrt2]`

B

`[1,oo`

C

`[1,sqrt2 , - 1] cup [1,sqrt2]`

D

`-oo ,1] cup [ 1,oo`

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