If cos^(-1) ((1-x^2)/(1+x^2)) + cos^(-1)...

If `cos^(-1) ((1-x^2)/(1+x^2)) + cos^(-1) ((1-y^2)/(1+y^2))= (pi)/(2)`, where `xy lt 1`, then
a)`x-y-xy=1`
b)`x- y+ xy=1`
c)`x+y-xy=1`
d)`x+y+xy=1`

A

`x-y-xy=1`

B

`x- y+ xy=1`

C

`x+y-xy=1`

D

`x+y+xy=1`

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The correct Answer is:

D

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