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Let any point P, on the lower branch of ...

Let any point P, on the lower branch of the hyperbola satisfies `PS-PS'=4`, where S & S' are foci and lies on y-axis. If a line passing through L(-2,0) and S' inter- sects the line passing through M(4,0) and S in R, then locus of R is `2x^2-8x + 3xy = 2lambda`, then `lambda =`

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