If tan 35^(@) = k , then the value of...

If ` tan 35^(@) = k , ` then the value of `( tan 145^(@) - tan 125^(@))/(1+ tan 145^(@) tan 125^(@))`=

A

`(2k)/(1-k^(2))`

B

`(2k)/(1+k^(2))`

C

`(1-k^(2))/(2k)`

D

`(1-k^(2))/(1+k^(2))`

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