The point of contact of tangent from the point \( (1,2) \) to the c...

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The point of contact of tangent from the point \( (1,2) \) to the circle \( x^{2}+y^{2}=1 \) has the coordinates
\( \mathrm{P} \)
(a) \( (1,0) \)
(b) \( (-1,0 \) ! \( ) \)
(c) \( \left(\frac{3}{5}, \frac{-4}{5}\right) \)
(d) \( \left(\frac{-3}{5}, \frac{4}{5}\right) \)
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