If tan^(2)x+secx -a = 0 has atleast one ...

If `tan^(2)x+secx -a = 0` has atleast one solution, then complete set of values of a is :

A

`(-oo, 1]`

B

`[-1, oo)`

C

`[(9)/(4) , oo)`

D

`[1, oo)`

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The correct Answer is:

B

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