Let a common tangent to the curves y2 4x and x 42 y2 16 touc: null (Mathematics) Question | DivineJEE | DivineJEE

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Let a common tangent to the curves ${y^2} = 4x$ and ${(x - 4)^2} + {y^2} = 16$ touch the curves at the points P and Q. Then ${(PQ)^2}$ is equal to __________.

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