circle

Question: The lengths of tangents from a fixed point to three circles of coaxial system are ${{t}_{1}},{{t}_{2}},{{t}_{3}}$ and if P, Q and R be the centres, then $QRt_{1}^{2}+RPt_{2}^{2}+PQt_{3}^{2}$ is equal to



1) 1
2) 2
3) 3
4) 0
Solution: Explanation: No Explanation
System of circles

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