1.

ax+b(sec(tan^(-1)x))=c and ay+b(sec(tan^(-1)y))=c The value of (x+y)/(1-xy) is

Answer»

`(2ab)/(a^(2)-b^(2))`
`(2AC)/(a^(2)-c^(2))`
`(c^(2)-b^(2))/(a^(2)+b^(2))`
NONE of these

Answer :B


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