The expression ( 1+ "tan" x + "tan"^(2) ...

The expression `( 1+ "tan" x + "tan"^(2) x) (1-"cot" x + "cot"^(2) x)` has the positive values of x, given by

A

`[0, (pi)/(2)]`

B

`[0,pi]`

C

`R-{x=(npi)/(2), n in I}`

D

`[0, oo]`

Verified by Experts

The correct Answer is:

C

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