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Let S={x in (-pi/2,pi/2) : 9^(1-tan^2x)+...

Let `S={x in (-pi/2,pi/2) : 9^(1-tan^2x)+9^(tan^2x)=10}` and `beta=sum_(x in s) tan^2x/3`, then `1/6(beta-14)^2` is equal to

A

16

B

8

C

64

D

32

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