If e^x=(sqrt(1+t)-sqrt(1-t))/(sqrt(1+t)...

If `e^x=(sqrt(1+t)-sqrt(1-t))/(sqrt(1+t)+sqrt(1-t))a n dtany/2=sqrt((1-t)/(1+t))` ,then `(dy)/(dx)` at `t=1/2` is (a)`-1/2` (b) `1/2` (c) 0 (d) none of these

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