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If (cos^2 theta -1)(1+tan^2 theta )+2 ta...

If `(cos^2 theta -1)(1+tan^2 theta )+2 tan^2 theta =1,0^@ < theta < 90^@`, then `theta` is
यदि `(cos^2 theta -1)(1+tan^2 theta )+2 tan^2 theta =1`,है, जहाँ `0^@ < theta < 90^@`, तो `theta` का मान होगा :

A

`45^@`

B

`60^@`

C

`30^@`

D

`90^@`

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