Let P and Q are two points in the xy pla...

Let P and Q are two points in the xy plane on the curve `y = x^(11) - 2x^(7) + 7x^(3) + 11x + 6` such that `vec(OP) cdot hati = 5, vec(OQ) cdot hati = -5`, then the magnitude of `vec(OP) + vec(OQ)` is

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