\[
\lim _{t \rightarrow \infty} \frac{\sqrt{2 t^{2}-t-1}-\sqrt{t^{2}-t+1}}{t(\tan \pi / 8)}
\]
(...
\[
\lim _{t \rightarrow \infty} \frac{\sqrt{2 t^{2}-t-1}-\sqrt{t^{2}-t+1}}{t(\tan \pi / 8)}
\]
(a) 0
(b) 1
(c) -1
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0