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If the normal to the rectangular hyperbola \( x y=4 \) at
\( \mathrm{P} \) the point \( \left(2 t_{1}, \frac{2}{t_{1}}\right) \) meets the curve again at

W \( \left(2 t_{2}, \frac{2}{t_{2}}\right) \), then
(1) \( t_{1}^{3} t_{2}=1 \)
(2) \( t_{1}^{3} t_{2}=-1 \)
(3) \( t_{2}^{3} t_{1}=1 \)
(4) \( t_{1} t_{2}^{3}=-1 \)
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