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If 0lethetale(pi)/(2)andsec^(2)theta+tan...

If `0lethetale(pi)/(2)andsec^(2)theta+tan^(2)theta=7` , then `theta` is

A

`(5 pi)/(12)` radian

B

`(pi)/(3)` radian

C

`(pi)/(5)` radian

D

`(pi)/(6)` radian

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