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If xy<1,tan^-1x+tan^-1y=........ a)tan^-...

If `xy<1,tan^-1x+tan^-1y`=........ a)`tan^-1(frac(x-y)(1+xy))`
b)`tan^-1(frac(x+y)(1-xy))` c)`(tanx+tany)/(1-tanxtany)` d)`(tanx-tany)/(1-tanxtany)`

A

`tan^-1((x-y)/(1+xy))`

B

`tan^-1((x+y)/(1-xy))`

C

`(tanx+tany)/(1-tanx.tany)`

D

`(tanx-tany)/(1+tanx.tany)`

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