If \( 2 x-y+1=0 \) is a tangent to the hyperbola \( \mathrm{P}^{13}...

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If \( 2 x-y+1=0 \) is a tangent to the hyperbola
\( \mathrm{P}^{13} \) \( \frac{x^{2}}{a^{2}}-\frac{y^{2}}{16}=1 \), then which of the following can be

W
sides of a right-angled triangle
(1) \( a, 4,1 \)
(2) \( 2 a, 4,1 \)
(3) \( a, 4,2 \)
(4) \( 2 a, 8,1 \)
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