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If ST and SN are the lengths of subtange...

If `ST` and `SN` are the lengths of subtangents and subnormals respectively to the curve `by^2 = (x + 2a)^3.` then `(ST^2)/(SN)` equals (A)`1` (B) `(8b)/27` (C) `(27b)/8` (D) `((4b)/9)`

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