The equation tan^(4) x - 2 sec ^(2) x + ...

The equation `tan^(4) x - 2 sec ^(2) x + a = 0` will have at least one solution if

A

`1 lt a le 4`

B

`a le 2`

C

`a le 3`

D

`a gt 3`

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The correct Answer is:

C

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