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The value of the expression ((sin3theta)...

The value of the expression `((sin3theta)/sin theta)^2-((cos3theta)/costheta)^2` when `theta=7.5^@`

A

`4(sqrt3+1)`

B

`(sqrt3-1)`

C

`2(sqrt6+sqrt2)`

D

`(8)/(sqrt6-sqrt2)`

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