If f:[0,pi/2)->R is defined as f(theta)...

If `f:[0,pi/2)->R` is defined as `f(theta)=|(1,tantheta,1),(-tantheta,1,tantheta),(-1,-tantheta,1)|` Then, the range of `f` is

A

1) `(2,oo)`

B

2) `(-oo, -2)`

C

3) `[2,oo)`

D

4) `(-oo, 2]`

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The correct Answer is:

C

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