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A straight line through the vertex `P` of a triangle `P Q R` intersects the side `P Q` at the point `S` and the circumcircle of the triangle `P Q R` at the point `Tdot` If `S` is not the center of the circumcircle, then `1/(P S)+1/(S T)<2/(sqrt(Q SxS R))` `1/(P S)+1/(S T)>2/(sqrt(Q S x S R))` `1/(P S)+1/(S T)<4/(Q R)` (d) `1/(p s)+1/(S T)>4/(Q R)`

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