tan(60^@+A)tan(60^@-A) is equal to...

`tan(60^@+A)tan(60^@-A)` is equal to

A

1) `(2cos2A+1)/(2cos2A-1)`

B

2) `(2cos2A-1)/(2cos2A+1)`

C

3) `(cos2A+21)/(cos2A-1)`

D

4) `(cos2A-1)/(cos2A+21)`

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