1.

Let x,y be real members such that x ne y and xy ne1. If ax + b sec (tan^(-1)x)=c and ay+ b sec (tan^(-1)y) =c," then "(x+y)/(1-xy)=

Answer»

`(2ab)/(a^(2)-B^(2))`
`(2AC)/(a^(2)+c^(2))`
`(2ab)/(a^(2)+b^(2))`
`(2ac)/(a^(2)-c^(2))`

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