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

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If \( 2 x-y+1=0 \) is a tangent to the hyperbola \( x^{2} / a^{2}- \)
P \( y^{2} / 16=1 \), then which of the following cannot be

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