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tan ( 2 tan^(-1) ((2)/(5))) is equal to...

`tan ( 2 tan^(-1) ((2)/(5)))` is equal to

A

`(8)/(5)`

B

`(10)/(21)`

C

`(20)/(21)`

D

`(21)/(25)`

Text Solution

Verified by Experts

The correct Answer is:
C
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