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જો ax+b(sec (tan^-1 x))= c અને ay+b (sec...

જો `ax+b(sec (tan^-1 x))= c` અને `ay+b (sec(tan^-1 y ))=c` અને `(x+y)/(1-xy)=`_____

A

`(ac)/(a^2+c^2)`

B

`(2ac)/(a-c)`

C

`(2ac)/(a^2-c^2)`

D

`(a+c)/(1-ac)`

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